projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
regulator: core: Fix cast to pointer from integer of different size warning
[linux-block.git] / drivers / regulator / core.c
CommitLineData
414c70cb
LG		 1/*
2 * core.c -- Voltage/Current Regulator framework.
3 *
4 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
a5766f11 5 * Copyright 2008 SlimLogic Ltd.
414c70cb 6 *
a5766f11 7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
414c70cb
LG		 8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 */
15
16#include <linux/kernel.h>
17#include <linux/init.h>
1130e5b3 18#include <linux/debugfs.h>
414c70cb 19#include <linux/device.h>
5a0e3ad6 20#include <linux/slab.h>
f21e0e81 21#include <linux/async.h>
414c70cb
LG		 22#include <linux/err.h>
23#include <linux/mutex.h>
24#include <linux/suspend.h>
31aae2be 25#include <linux/delay.h>
65f73508 26#include <linux/gpio.h>
69511a45 27#include <linux/of.h>
65b19ce6 28#include <linux/regmap.h>
69511a45 29#include <linux/regulator/of_regulator.h>
414c70cb
LG		 30#include <linux/regulator/consumer.h>
31#include <linux/regulator/driver.h>
32#include <linux/regulator/machine.h>
65602c32 33#include <linux/module.h>
414c70cb 34
02fa3ec0
MB		 35#define CREATE_TRACE_POINTS
36#include <trace/events/regulator.h>
37
34abbd68
MB		 38#include "dummy.h"
39
7d51a0db
MB		 40#define rdev_crit(rdev, fmt, ...) \
41 pr_crit("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
5da84fd9
JP		 42#define rdev_err(rdev, fmt, ...) \
43 pr_err("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
44#define rdev_warn(rdev, fmt, ...) \
45 pr_warn("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
46#define rdev_info(rdev, fmt, ...) \
47 pr_info("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
48#define rdev_dbg(rdev, fmt, ...) \
49 pr_debug("%s: " fmt, rdev_get_name(rdev), ##__VA_ARGS__)
50
414c70cb
LG		 51static DEFINE_MUTEX(regulator_list_mutex);
52static LIST_HEAD(regulator_list);
53static LIST_HEAD(regulator_map_list);
21cf891a 54static bool has_full_constraints;
688fe99a 55static bool board_wants_dummy_regulator;
414c70cb 56
1130e5b3 57static struct dentry *debugfs_root;
1130e5b3 58
8dc5390d 59/*
414c70cb
LG		 60 * struct regulator_map
61 *
62 * Used to provide symbolic supply names to devices.
63 */
64struct regulator_map {
65 struct list_head list;
40f9244f 66 const char *dev_name; /* The dev_name() for the consumer */
414c70cb 67 const char *supply;
a5766f11 68 struct regulator_dev *regulator;
414c70cb
LG		 69};
70
414c70cb
LG		 71/*
72 * struct regulator
73 *
74 * One for each consumer device.
75 */
76struct regulator {
77 struct device *dev;
78 struct list_head list;
6492bc1b 79 unsigned int always_on:1;
414c70cb
LG		 80 int uA_load;
81 int min_uV;
82 int max_uV;
414c70cb
LG		 83 char *supply_name;
84 struct device_attribute dev_attr;
85 struct regulator_dev *rdev;
5de70519 86 struct dentry *debugfs;
414c70cb
LG		 87};
88
89static int _regulator_is_enabled(struct regulator_dev *rdev);
3801b86a 90static int _regulator_disable(struct regulator_dev *rdev);
414c70cb
LG		 91static int _regulator_get_voltage(struct regulator_dev *rdev);
92static int _regulator_get_current_limit(struct regulator_dev *rdev);
93static unsigned int _regulator_get_mode(struct regulator_dev *rdev);
94static void _notifier_call_chain(struct regulator_dev *rdev,
95 unsigned long event, void *data);
75790251
MB		 96static int _regulator_do_set_voltage(struct regulator_dev *rdev,
97 int min_uV, int max_uV);
3801b86a
MB		 98static struct regulator *create_regulator(struct regulator_dev *rdev,
99 struct device *dev,
100 const char *supply_name);
414c70cb 101
1083c393
MB		 102static const char *rdev_get_name(struct regulator_dev *rdev)
103{
104 if (rdev->constraints && rdev->constraints->name)
105 return rdev->constraints->name;
106 else if (rdev->desc->name)
107 return rdev->desc->name;
108 else
109 return "";
110}
111
69511a45
RN		 112/**
113 * of_get_regulator - get a regulator device node based on supply name
114 * @dev: Device pointer for the consumer (of regulator) device
115 * @supply: regulator supply name
116 *
117 * Extract the regulator device node corresponding to the supply name.
118 * retruns the device node corresponding to the regulator if found, else
119 * returns NULL.
120 */
121static struct device_node *of_get_regulator(struct device *dev, const char *supply)
122{
123 struct device_node *regnode = NULL;
124 char prop_name[32]; /* 32 is max size of property name */
125
126 dev_dbg(dev, "Looking up %s-supply from device tree\n", supply);
127
128 snprintf(prop_name, 32, "%s-supply", supply);
129 regnode = of_parse_phandle(dev->of_node, prop_name, 0);
130
131 if (!regnode) {
16fbcc3b 132 dev_dbg(dev, "Looking up %s property in node %s failed",
69511a45
RN		 133 prop_name, dev->of_node->full_name);
134 return NULL;
135 }
136 return regnode;
137}
138
6492bc1b
MB		 139static int _regulator_can_change_status(struct regulator_dev *rdev)
140{
141 if (!rdev->constraints)
142 return 0;
143
144 if (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_STATUS)
145 return 1;
146 else
147 return 0;
148}
149
414c70cb
LG		 150/* Platform voltage constraint check */
151static int regulator_check_voltage(struct regulator_dev *rdev,
152 int *min_uV, int *max_uV)
153{
154 BUG_ON(*min_uV > *max_uV);
155
156 if (!rdev->constraints) {
5da84fd9 157 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 158 return -ENODEV;
159 }
160 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
5da84fd9 161 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 162 return -EPERM;
163 }
164
165 if (*max_uV > rdev->constraints->max_uV)
166 *max_uV = rdev->constraints->max_uV;
167 if (*min_uV < rdev->constraints->min_uV)
168 *min_uV = rdev->constraints->min_uV;
169
89f425ed
MB		 170 if (*min_uV > *max_uV) {
171 rdev_err(rdev, "unsupportable voltage range: %d-%duV\n",
54abd335 172 *min_uV, *max_uV);
414c70cb 173 return -EINVAL;
89f425ed 174 }
414c70cb
LG		 175
176 return 0;
177}
178
05fda3b1
TP		 179/* Make sure we select a voltage that suits the needs of all
180 * regulator consumers
181 */
182static int regulator_check_consumers(struct regulator_dev *rdev,
183 int *min_uV, int *max_uV)
184{
185 struct regulator *regulator;
186
187 list_for_each_entry(regulator, &rdev->consumer_list, list) {
4aa922c0
MB		 188 /*
189 * Assume consumers that didn't say anything are OK
190 * with anything in the constraint range.
191 */
192 if (!regulator->min_uV && !regulator->max_uV)
193 continue;
194
05fda3b1
TP		 195 if (*max_uV > regulator->max_uV)
196 *max_uV = regulator->max_uV;
197 if (*min_uV < regulator->min_uV)
198 *min_uV = regulator->min_uV;
199 }
200
201 if (*min_uV > *max_uV)
202 return -EINVAL;
203
204 return 0;
205}
206
414c70cb
LG		 207/* current constraint check */
208static int regulator_check_current_limit(struct regulator_dev *rdev,
209 int *min_uA, int *max_uA)
210{
211 BUG_ON(*min_uA > *max_uA);
212
213 if (!rdev->constraints) {
5da84fd9 214 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 215 return -ENODEV;
216 }
217 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_CURRENT)) {
5da84fd9 218 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 219 return -EPERM;
220 }
221
222 if (*max_uA > rdev->constraints->max_uA)
223 *max_uA = rdev->constraints->max_uA;
224 if (*min_uA < rdev->constraints->min_uA)
225 *min_uA = rdev->constraints->min_uA;
226
89f425ed
MB		 227 if (*min_uA > *max_uA) {
228 rdev_err(rdev, "unsupportable current range: %d-%duA\n",
54abd335 229 *min_uA, *max_uA);
414c70cb 230 return -EINVAL;
89f425ed 231 }
414c70cb
LG		 232
233 return 0;
234}
235
236/* operating mode constraint check */
2c608234 237static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
414c70cb 238{
2c608234 239 switch (*mode) {
e573520b
DB		 240 case REGULATOR_MODE_FAST:
241 case REGULATOR_MODE_NORMAL:
242 case REGULATOR_MODE_IDLE:
243 case REGULATOR_MODE_STANDBY:
244 break;
245 default:
89f425ed 246 rdev_err(rdev, "invalid mode %x specified\n", *mode);
e573520b
DB		 247 return -EINVAL;
248 }
249
414c70cb 250 if (!rdev->constraints) {
5da84fd9 251 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 252 return -ENODEV;
253 }
254 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_MODE)) {
5da84fd9 255 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 256 return -EPERM;
257 }
2c608234
MB		 258
259 /* The modes are bitmasks, the most power hungry modes having
260 * the lowest values. If the requested mode isn't supported
261 * try higher modes. */
262 while (*mode) {
263 if (rdev->constraints->valid_modes_mask & *mode)
264 return 0;
265 *mode /= 2;
414c70cb 266 }
2c608234
MB		 267
268 return -EINVAL;
414c70cb
LG		 269}
270
271/* dynamic regulator mode switching constraint check */
272static int regulator_check_drms(struct regulator_dev *rdev)
273{
274 if (!rdev->constraints) {
5da84fd9 275 rdev_err(rdev, "no constraints\n");
414c70cb
LG		 276 return -ENODEV;
277 }
278 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS)) {
5da84fd9 279 rdev_err(rdev, "operation not allowed\n");
414c70cb
LG		 280 return -EPERM;
281 }
282 return 0;
283}
284
414c70cb
LG		 285static ssize_t regulator_uV_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
287{
a5766f11 288 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 289 ssize_t ret;
290
291 mutex_lock(&rdev->mutex);
292 ret = sprintf(buf, "%d\n", _regulator_get_voltage(rdev));
293 mutex_unlock(&rdev->mutex);
294
295 return ret;
296}
7ad68e2f 297static DEVICE_ATTR(microvolts, 0444, regulator_uV_show, NULL);
414c70cb
LG		 298
299static ssize_t regulator_uA_show(struct device *dev,
300 struct device_attribute *attr, char *buf)
301{
a5766f11 302 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 303
304 return sprintf(buf, "%d\n", _regulator_get_current_limit(rdev));
305}
7ad68e2f 306static DEVICE_ATTR(microamps, 0444, regulator_uA_show, NULL);
414c70cb 307
bc558a60
MB		 308static ssize_t regulator_name_show(struct device *dev,
309 struct device_attribute *attr, char *buf)
310{
311 struct regulator_dev *rdev = dev_get_drvdata(dev);
bc558a60 312
1083c393 313 return sprintf(buf, "%s\n", rdev_get_name(rdev));
bc558a60
MB		 314}
315
4fca9545 316static ssize_t regulator_print_opmode(char *buf, int mode)
414c70cb 317{
414c70cb
LG		 318 switch (mode) {
319 case REGULATOR_MODE_FAST:
320 return sprintf(buf, "fast\n");
321 case REGULATOR_MODE_NORMAL:
322 return sprintf(buf, "normal\n");
323 case REGULATOR_MODE_IDLE:
324 return sprintf(buf, "idle\n");
325 case REGULATOR_MODE_STANDBY:
326 return sprintf(buf, "standby\n");
327 }
328 return sprintf(buf, "unknown\n");
329}
330
4fca9545
DB		 331static ssize_t regulator_opmode_show(struct device *dev,
332 struct device_attribute *attr, char *buf)
414c70cb 333{
a5766f11 334 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 335
4fca9545
DB		 336 return regulator_print_opmode(buf, _regulator_get_mode(rdev));
337}
7ad68e2f 338static DEVICE_ATTR(opmode, 0444, regulator_opmode_show, NULL);
4fca9545
DB		 339
340static ssize_t regulator_print_state(char *buf, int state)
341{
414c70cb
LG		 342 if (state > 0)
343 return sprintf(buf, "enabled\n");
344 else if (state == 0)
345 return sprintf(buf, "disabled\n");
346 else
347 return sprintf(buf, "unknown\n");
348}
349
4fca9545
DB		 350static ssize_t regulator_state_show(struct device *dev,
351 struct device_attribute *attr, char *buf)
352{
353 struct regulator_dev *rdev = dev_get_drvdata(dev);
9332546f
MB		 354 ssize_t ret;
355
356 mutex_lock(&rdev->mutex);
357 ret = regulator_print_state(buf, _regulator_is_enabled(rdev));
358 mutex_unlock(&rdev->mutex);
4fca9545 359
9332546f 360 return ret;
4fca9545 361}
7ad68e2f 362static DEVICE_ATTR(state, 0444, regulator_state_show, NULL);
4fca9545 363
853116a1
DB		 364static ssize_t regulator_status_show(struct device *dev,
365 struct device_attribute *attr, char *buf)
366{
367 struct regulator_dev *rdev = dev_get_drvdata(dev);
368 int status;
369 char *label;
370
371 status = rdev->desc->ops->get_status(rdev);
372 if (status < 0)
373 return status;
374
375 switch (status) {
376 case REGULATOR_STATUS_OFF:
377 label = "off";
378 break;
379 case REGULATOR_STATUS_ON:
380 label = "on";
381 break;
382 case REGULATOR_STATUS_ERROR:
383 label = "error";
384 break;
385 case REGULATOR_STATUS_FAST:
386 label = "fast";
387 break;
388 case REGULATOR_STATUS_NORMAL:
389 label = "normal";
390 break;
391 case REGULATOR_STATUS_IDLE:
392 label = "idle";
393 break;
394 case REGULATOR_STATUS_STANDBY:
395 label = "standby";
396 break;
1beaf762
KG		 397 case REGULATOR_STATUS_UNDEFINED:
398 label = "undefined";
399 break;
853116a1
DB		 400 default:
401 return -ERANGE;
402 }
403
404 return sprintf(buf, "%s\n", label);
405}
406static DEVICE_ATTR(status, 0444, regulator_status_show, NULL);
407
414c70cb
LG		 408static ssize_t regulator_min_uA_show(struct device *dev,
409 struct device_attribute *attr, char *buf)
410{
a5766f11 411 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 412
413 if (!rdev->constraints)
414 return sprintf(buf, "constraint not defined\n");
415
416 return sprintf(buf, "%d\n", rdev->constraints->min_uA);
417}
7ad68e2f 418static DEVICE_ATTR(min_microamps, 0444, regulator_min_uA_show, NULL);
414c70cb
LG		 419
420static ssize_t regulator_max_uA_show(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
a5766f11 423 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 424
425 if (!rdev->constraints)
426 return sprintf(buf, "constraint not defined\n");
427
428 return sprintf(buf, "%d\n", rdev->constraints->max_uA);
429}
7ad68e2f 430static DEVICE_ATTR(max_microamps, 0444, regulator_max_uA_show, NULL);
414c70cb
LG		 431
432static ssize_t regulator_min_uV_show(struct device *dev,
433 struct device_attribute *attr, char *buf)
434{
a5766f11 435 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 436
437 if (!rdev->constraints)
438 return sprintf(buf, "constraint not defined\n");
439
440 return sprintf(buf, "%d\n", rdev->constraints->min_uV);
441}
7ad68e2f 442static DEVICE_ATTR(min_microvolts, 0444, regulator_min_uV_show, NULL);
414c70cb
LG		 443
444static ssize_t regulator_max_uV_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446{
a5766f11 447 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 448
449 if (!rdev->constraints)
450 return sprintf(buf, "constraint not defined\n");
451
452 return sprintf(buf, "%d\n", rdev->constraints->max_uV);
453}
7ad68e2f 454static DEVICE_ATTR(max_microvolts, 0444, regulator_max_uV_show, NULL);
414c70cb
LG		 455
456static ssize_t regulator_total_uA_show(struct device *dev,
457 struct device_attribute *attr, char *buf)
458{
a5766f11 459 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 460 struct regulator *regulator;
461 int uA = 0;
462
463 mutex_lock(&rdev->mutex);
464 list_for_each_entry(regulator, &rdev->consumer_list, list)
fa2984d4 465 uA += regulator->uA_load;
414c70cb
LG		 466 mutex_unlock(&rdev->mutex);
467 return sprintf(buf, "%d\n", uA);
468}
7ad68e2f 469static DEVICE_ATTR(requested_microamps, 0444, regulator_total_uA_show, NULL);
414c70cb
LG		 470
471static ssize_t regulator_num_users_show(struct device *dev,
472 struct device_attribute *attr, char *buf)
473{
a5766f11 474 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 475 return sprintf(buf, "%d\n", rdev->use_count);
476}
477
478static ssize_t regulator_type_show(struct device *dev,
479 struct device_attribute *attr, char *buf)
480{
a5766f11 481 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 482
483 switch (rdev->desc->type) {
484 case REGULATOR_VOLTAGE:
485 return sprintf(buf, "voltage\n");
486 case REGULATOR_CURRENT:
487 return sprintf(buf, "current\n");
488 }
489 return sprintf(buf, "unknown\n");
490}
491
492static ssize_t regulator_suspend_mem_uV_show(struct device *dev,
493 struct device_attribute *attr, char *buf)
494{
a5766f11 495 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 496
414c70cb
LG		 497 return sprintf(buf, "%d\n", rdev->constraints->state_mem.uV);
498}
7ad68e2f
DB		 499static DEVICE_ATTR(suspend_mem_microvolts, 0444,
500 regulator_suspend_mem_uV_show, NULL);
414c70cb
LG		 501
502static ssize_t regulator_suspend_disk_uV_show(struct device *dev,
503 struct device_attribute *attr, char *buf)
504{
a5766f11 505 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 506
414c70cb
LG		 507 return sprintf(buf, "%d\n", rdev->constraints->state_disk.uV);
508}
7ad68e2f
DB		 509static DEVICE_ATTR(suspend_disk_microvolts, 0444,
510 regulator_suspend_disk_uV_show, NULL);
414c70cb
LG		 511
512static ssize_t regulator_suspend_standby_uV_show(struct device *dev,
513 struct device_attribute *attr, char *buf)
514{
a5766f11 515 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 516
414c70cb
LG		 517 return sprintf(buf, "%d\n", rdev->constraints->state_standby.uV);
518}
7ad68e2f
DB		 519static DEVICE_ATTR(suspend_standby_microvolts, 0444,
520 regulator_suspend_standby_uV_show, NULL);
414c70cb 521
414c70cb
LG		 522static ssize_t regulator_suspend_mem_mode_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
a5766f11 525 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 526
4fca9545
DB		 527 return regulator_print_opmode(buf,
528 rdev->constraints->state_mem.mode);
414c70cb 529}
7ad68e2f
DB		 530static DEVICE_ATTR(suspend_mem_mode, 0444,
531 regulator_suspend_mem_mode_show, NULL);
414c70cb
LG		 532
533static ssize_t regulator_suspend_disk_mode_show(struct device *dev,
534 struct device_attribute *attr, char *buf)
535{
a5766f11 536 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 537
4fca9545
DB		 538 return regulator_print_opmode(buf,
539 rdev->constraints->state_disk.mode);
414c70cb 540}
7ad68e2f
DB		 541static DEVICE_ATTR(suspend_disk_mode, 0444,
542 regulator_suspend_disk_mode_show, NULL);
414c70cb
LG		 543
544static ssize_t regulator_suspend_standby_mode_show(struct device *dev,
545 struct device_attribute *attr, char *buf)
546{
a5766f11 547 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 548
4fca9545
DB		 549 return regulator_print_opmode(buf,
550 rdev->constraints->state_standby.mode);
414c70cb 551}
7ad68e2f
DB		 552static DEVICE_ATTR(suspend_standby_mode, 0444,
553 regulator_suspend_standby_mode_show, NULL);
414c70cb
LG		 554
555static ssize_t regulator_suspend_mem_state_show(struct device *dev,
556 struct device_attribute *attr, char *buf)
557{
a5766f11 558 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 559
4fca9545
DB		 560 return regulator_print_state(buf,
561 rdev->constraints->state_mem.enabled);
414c70cb 562}
7ad68e2f
DB		 563static DEVICE_ATTR(suspend_mem_state, 0444,
564 regulator_suspend_mem_state_show, NULL);
414c70cb
LG		 565
566static ssize_t regulator_suspend_disk_state_show(struct device *dev,
567 struct device_attribute *attr, char *buf)
568{
a5766f11 569 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 570
4fca9545
DB		 571 return regulator_print_state(buf,
572 rdev->constraints->state_disk.enabled);
414c70cb 573}
7ad68e2f
DB		 574static DEVICE_ATTR(suspend_disk_state, 0444,
575 regulator_suspend_disk_state_show, NULL);
414c70cb
LG		 576
577static ssize_t regulator_suspend_standby_state_show(struct device *dev,
578 struct device_attribute *attr, char *buf)
579{
a5766f11 580 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb 581
4fca9545
DB		 582 return regulator_print_state(buf,
583 rdev->constraints->state_standby.enabled);
414c70cb 584}
7ad68e2f
DB		 585static DEVICE_ATTR(suspend_standby_state, 0444,
586 regulator_suspend_standby_state_show, NULL);
587
bc558a60 588
7ad68e2f
DB		 589/*
590 * These are the only attributes are present for all regulators.
591 * Other attributes are a function of regulator functionality.
592 */
414c70cb 593static struct device_attribute regulator_dev_attrs[] = {
bc558a60 594 __ATTR(name, 0444, regulator_name_show, NULL),
414c70cb
LG		 595 __ATTR(num_users, 0444, regulator_num_users_show, NULL),
596 __ATTR(type, 0444, regulator_type_show, NULL),
414c70cb
LG		 597 __ATTR_NULL,
598};
599
600static void regulator_dev_release(struct device *dev)
601{
a5766f11 602 struct regulator_dev *rdev = dev_get_drvdata(dev);
414c70cb
LG		 603 kfree(rdev);
604}
605
606static struct class regulator_class = {
607 .name = "regulator",
608 .dev_release = regulator_dev_release,
609 .dev_attrs = regulator_dev_attrs,
610};
611
612/* Calculate the new optimum regulator operating mode based on the new total
613 * consumer load. All locks held by caller */
614static void drms_uA_update(struct regulator_dev *rdev)
615{
616 struct regulator *sibling;
617 int current_uA = 0, output_uV, input_uV, err;
618 unsigned int mode;
619
620 err = regulator_check_drms(rdev);
621 if (err < 0 || !rdev->desc->ops->get_optimum_mode ||
476c2d83
MB		 622 (!rdev->desc->ops->get_voltage &&
623 !rdev->desc->ops->get_voltage_sel) ||
624 !rdev->desc->ops->set_mode)
036de8ef 625 return;
414c70cb
LG		 626
627 /* get output voltage */
1bf5a1f8 628 output_uV = _regulator_get_voltage(rdev);
414c70cb
LG		 629 if (output_uV <= 0)
630 return;
631
632 /* get input voltage */
1bf5a1f8
MB		 633 input_uV = 0;
634 if (rdev->supply)
3f24f5ad 635 input_uV = regulator_get_voltage(rdev->supply);
1bf5a1f8 636 if (input_uV <= 0)
414c70cb
LG		 637 input_uV = rdev->constraints->input_uV;
638 if (input_uV <= 0)
639 return;
640
641 /* calc total requested load */
642 list_for_each_entry(sibling, &rdev->consumer_list, list)
fa2984d4 643 current_uA += sibling->uA_load;
414c70cb
LG		 644
645 /* now get the optimum mode for our new total regulator load */
646 mode = rdev->desc->ops->get_optimum_mode(rdev, input_uV,
647 output_uV, current_uA);
648
649 /* check the new mode is allowed */
2c608234 650 err = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 651 if (err == 0)
652 rdev->desc->ops->set_mode(rdev, mode);
653}
654
655static int suspend_set_state(struct regulator_dev *rdev,
656 struct regulator_state *rstate)
657{
658 int ret = 0;
638f85c5
MB		 659
660 /* If we have no suspend mode configration don't set anything;
8ac0e95d
AL		 661 * only warn if the driver implements set_suspend_voltage or
662 * set_suspend_mode callback.
638f85c5
MB		 663 */
664 if (!rstate->enabled && !rstate->disabled) {
8ac0e95d
AL		 665 if (rdev->desc->ops->set_suspend_voltage ||
666 rdev->desc->ops->set_suspend_mode)
5da84fd9 667 rdev_warn(rdev, "No configuration\n");
638f85c5
MB		 668 return 0;
669 }
670
671 if (rstate->enabled && rstate->disabled) {
5da84fd9 672 rdev_err(rdev, "invalid configuration\n");
638f85c5
MB		 673 return -EINVAL;
674 }
414c70cb 675
8ac0e95d 676 if (rstate->enabled && rdev->desc->ops->set_suspend_enable)
414c70cb 677 ret = rdev->desc->ops->set_suspend_enable(rdev);
8ac0e95d 678 else if (rstate->disabled && rdev->desc->ops->set_suspend_disable)
414c70cb 679 ret = rdev->desc->ops->set_suspend_disable(rdev);
8ac0e95d
AL		 680 else /* OK if set_suspend_enable or set_suspend_disable is NULL */
681 ret = 0;
682
414c70cb 683 if (ret < 0) {
5da84fd9 684 rdev_err(rdev, "failed to enabled/disable\n");
414c70cb
LG		 685 return ret;
686 }
687
688 if (rdev->desc->ops->set_suspend_voltage && rstate->uV > 0) {
689 ret = rdev->desc->ops->set_suspend_voltage(rdev, rstate->uV);
690 if (ret < 0) {
5da84fd9 691 rdev_err(rdev, "failed to set voltage\n");
414c70cb
LG		 692 return ret;
693 }
694 }
695
696 if (rdev->desc->ops->set_suspend_mode && rstate->mode > 0) {
697 ret = rdev->desc->ops->set_suspend_mode(rdev, rstate->mode);
698 if (ret < 0) {
5da84fd9 699 rdev_err(rdev, "failed to set mode\n");
414c70cb
LG		 700 return ret;
701 }
702 }
703 return ret;
704}
705
706/* locks held by caller */
707static int suspend_prepare(struct regulator_dev *rdev, suspend_state_t state)
708{
709 if (!rdev->constraints)
710 return -EINVAL;
711
712 switch (state) {
713 case PM_SUSPEND_STANDBY:
714 return suspend_set_state(rdev,
715 &rdev->constraints->state_standby);
716 case PM_SUSPEND_MEM:
717 return suspend_set_state(rdev,
718 &rdev->constraints->state_mem);
719 case PM_SUSPEND_MAX:
720 return suspend_set_state(rdev,
721 &rdev->constraints->state_disk);
722 default:
723 return -EINVAL;
724 }
725}
726
727static void print_constraints(struct regulator_dev *rdev)
728{
729 struct regulation_constraints *constraints = rdev->constraints;
973e9a27 730 char buf[80] = "";
8f031b48
MB		 731 int count = 0;
732 int ret;
414c70cb 733
8f031b48 734 if (constraints->min_uV && constraints->max_uV) {
414c70cb 735 if (constraints->min_uV == constraints->max_uV)
8f031b48
MB		 736 count += sprintf(buf + count, "%d mV ",
737 constraints->min_uV / 1000);
414c70cb 738 else
8f031b48
MB		 739 count += sprintf(buf + count, "%d <--> %d mV ",
740 constraints->min_uV / 1000,
741 constraints->max_uV / 1000);
742 }
743
744 if (!constraints->min_uV ||
745 constraints->min_uV != constraints->max_uV) {
746 ret = _regulator_get_voltage(rdev);
747 if (ret > 0)
748 count += sprintf(buf + count, "at %d mV ", ret / 1000);
749 }
750
bf5892a8
MB		 751 if (constraints->uV_offset)
752 count += sprintf(buf, "%dmV offset ",
753 constraints->uV_offset / 1000);
754
8f031b48 755 if (constraints->min_uA && constraints->max_uA) {
414c70cb 756 if (constraints->min_uA == constraints->max_uA)
8f031b48
MB		 757 count += sprintf(buf + count, "%d mA ",
758 constraints->min_uA / 1000);
414c70cb 759 else
8f031b48
MB		 760 count += sprintf(buf + count, "%d <--> %d mA ",
761 constraints->min_uA / 1000,
762 constraints->max_uA / 1000);
763 }
764
765 if (!constraints->min_uA ||
766 constraints->min_uA != constraints->max_uA) {
767 ret = _regulator_get_current_limit(rdev);
768 if (ret > 0)
e4a6376b 769 count += sprintf(buf + count, "at %d mA ", ret / 1000);
414c70cb 770 }
8f031b48 771
414c70cb
LG		 772 if (constraints->valid_modes_mask & REGULATOR_MODE_FAST)
773 count += sprintf(buf + count, "fast ");
774 if (constraints->valid_modes_mask & REGULATOR_MODE_NORMAL)
775 count += sprintf(buf + count, "normal ");
776 if (constraints->valid_modes_mask & REGULATOR_MODE_IDLE)
777 count += sprintf(buf + count, "idle ");
778 if (constraints->valid_modes_mask & REGULATOR_MODE_STANDBY)
779 count += sprintf(buf + count, "standby");
780
13ce29f8 781 rdev_info(rdev, "%s\n", buf);
4a682922
MB		 782
783 if ((constraints->min_uV != constraints->max_uV) &&
784 !(constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE))
785 rdev_warn(rdev,
786 "Voltage range but no REGULATOR_CHANGE_VOLTAGE\n");
414c70cb
LG		 787}
788
e79055d6 789static int machine_constraints_voltage(struct regulator_dev *rdev,
1083c393 790 struct regulation_constraints *constraints)
a5766f11 791{
e5fda26c 792 struct regulator_ops *ops = rdev->desc->ops;
af5866c9
MB		 793 int ret;
794
795 /* do we need to apply the constraint voltage */
796 if (rdev->constraints->apply_uV &&
75790251
MB		 797 rdev->constraints->min_uV == rdev->constraints->max_uV) {
798 ret = _regulator_do_set_voltage(rdev,
799 rdev->constraints->min_uV,
800 rdev->constraints->max_uV);
801 if (ret < 0) {
802 rdev_err(rdev, "failed to apply %duV constraint\n",
803 rdev->constraints->min_uV);
75790251
MB		 804 return ret;
805 }
af5866c9 806 }
e06f5b4f 807
4367cfdc
DB		 808 /* constrain machine-level voltage specs to fit
809 * the actual range supported by this regulator.
810 */
811 if (ops->list_voltage && rdev->desc->n_voltages) {
812 int count = rdev->desc->n_voltages;
813 int i;
814 int min_uV = INT_MAX;
815 int max_uV = INT_MIN;
816 int cmin = constraints->min_uV;
817 int cmax = constraints->max_uV;
818
3e590918
MB		 819 /* it's safe to autoconfigure fixed-voltage supplies
820 and the constraints are used by list_voltage. */
4367cfdc 821 if (count == 1 && !cmin) {
3e590918 822 cmin = 1;
4367cfdc 823 cmax = INT_MAX;
3e590918
MB		 824 constraints->min_uV = cmin;
825 constraints->max_uV = cmax;
4367cfdc
DB		 826 }
827
3e2b9abd
MB		 828 /* voltage constraints are optional */
829 if ((cmin == 0) && (cmax == 0))
e79055d6 830 return 0;
3e2b9abd 831
4367cfdc 832 /* else require explicit machine-level constraints */
3e2b9abd 833 if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
5da84fd9 834 rdev_err(rdev, "invalid voltage constraints\n");
e79055d6 835 return -EINVAL;
4367cfdc
DB		 836 }
837
838 /* initial: [cmin..cmax] valid, [min_uV..max_uV] not */
839 for (i = 0; i < count; i++) {
840 int value;
841
842 value = ops->list_voltage(rdev, i);
843 if (value <= 0)
844 continue;
845
846 /* maybe adjust [min_uV..max_uV] */
847 if (value >= cmin && value < min_uV)
848 min_uV = value;
849 if (value <= cmax && value > max_uV)
850 max_uV = value;
851 }
852
853 /* final: [min_uV..max_uV] valid iff constraints valid */
854 if (max_uV < min_uV) {
5da84fd9 855 rdev_err(rdev, "unsupportable voltage constraints\n");
e79055d6 856 return -EINVAL;
4367cfdc
DB		 857 }
858
859 /* use regulator's subset of machine constraints */
860 if (constraints->min_uV < min_uV) {
5da84fd9
JP		 861 rdev_dbg(rdev, "override min_uV, %d -> %d\n",
862 constraints->min_uV, min_uV);
4367cfdc
DB		 863 constraints->min_uV = min_uV;
864 }
865 if (constraints->max_uV > max_uV) {
5da84fd9
JP		 866 rdev_dbg(rdev, "override max_uV, %d -> %d\n",
867 constraints->max_uV, max_uV);
4367cfdc
DB		 868 constraints->max_uV = max_uV;
869 }
870 }
871
e79055d6
MB		 872 return 0;
873}
874
875/**
876 * set_machine_constraints - sets regulator constraints
877 * @rdev: regulator source
878 * @constraints: constraints to apply
879 *
880 * Allows platform initialisation code to define and constrain
881 * regulator circuits e.g. valid voltage/current ranges, etc. NOTE:
882 * Constraints *must* be set by platform code in order for some
883 * regulator operations to proceed i.e. set_voltage, set_current_limit,
884 * set_mode.
885 */
886static int set_machine_constraints(struct regulator_dev *rdev,
f8c12fe3 887 const struct regulation_constraints *constraints)
e79055d6
MB		 888{
889 int ret = 0;
e79055d6
MB		 890 struct regulator_ops *ops = rdev->desc->ops;
891
9a8f5e07
MB		 892 if (constraints)
893 rdev->constraints = kmemdup(constraints, sizeof(*constraints),
894 GFP_KERNEL);
895 else
896 rdev->constraints = kzalloc(sizeof(*constraints),
897 GFP_KERNEL);
f8c12fe3
MB		 898 if (!rdev->constraints)
899 return -ENOMEM;
af5866c9 900
f8c12fe3 901 ret = machine_constraints_voltage(rdev, rdev->constraints);
e79055d6
MB		 902 if (ret != 0)
903 goto out;
904
a5766f11 905 /* do we need to setup our suspend state */
9a8f5e07 906 if (rdev->constraints->initial_state) {
f8c12fe3 907 ret = suspend_prepare(rdev, rdev->constraints->initial_state);
e06f5b4f 908 if (ret < 0) {
5da84fd9 909 rdev_err(rdev, "failed to set suspend state\n");
e06f5b4f
MB		 910 goto out;
911 }
912 }
a5766f11 913
9a8f5e07 914 if (rdev->constraints->initial_mode) {
a308466c 915 if (!ops->set_mode) {
5da84fd9 916 rdev_err(rdev, "no set_mode operation\n");
a308466c
MB		 917 ret = -EINVAL;
918 goto out;
919 }
920
f8c12fe3 921 ret = ops->set_mode(rdev, rdev->constraints->initial_mode);
a308466c 922 if (ret < 0) {
5da84fd9 923 rdev_err(rdev, "failed to set initial mode: %d\n", ret);
a308466c
MB		 924 goto out;
925 }
926 }
927
cacf90f2
MB		 928 /* If the constraints say the regulator should be on at this point
929 * and we have control then make sure it is enabled.
930 */
f8c12fe3
MB		 931 if ((rdev->constraints->always_on || rdev->constraints->boot_on) &&
932 ops->enable) {
e5fda26c
MB		 933 ret = ops->enable(rdev);
934 if (ret < 0) {
5da84fd9 935 rdev_err(rdev, "failed to enable\n");
e5fda26c
MB		 936 goto out;
937 }
938 }
939
6f0b2c69
YSB		 940 if (rdev->constraints->ramp_delay && ops->set_ramp_delay) {
941 ret = ops->set_ramp_delay(rdev, rdev->constraints->ramp_delay);
942 if (ret < 0) {
943 rdev_err(rdev, "failed to set ramp_delay\n");
944 goto out;
945 }
946 }
947
a5766f11 948 print_constraints(rdev);
1a6958e7 949 return 0;
a5766f11 950out:
1a6958e7
AL		 951 kfree(rdev->constraints);
952 rdev->constraints = NULL;
a5766f11
LG		 953 return ret;
954}
955
956/**
957 * set_supply - set regulator supply regulator
69279fb9
MB		 958 * @rdev: regulator name
959 * @supply_rdev: supply regulator name
a5766f11
LG		 960 *
961 * Called by platform initialisation code to set the supply regulator for this
962 * regulator. This ensures that a regulators supply will also be enabled by the
963 * core if it's child is enabled.
964 */
965static int set_supply(struct regulator_dev *rdev,
3801b86a 966 struct regulator_dev *supply_rdev)
a5766f11
LG		 967{
968 int err;
969
3801b86a
MB		 970 rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev));
971
972 rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
32c78de8
AL		 973 if (rdev->supply == NULL) {
974 err = -ENOMEM;
3801b86a 975 return err;
a5766f11 976 }
57ad526a 977 supply_rdev->open_count++;
3801b86a
MB		 978
979 return 0;
a5766f11
LG		 980}
981
982/**
06c63f93 983 * set_consumer_device_supply - Bind a regulator to a symbolic supply
69279fb9 984 * @rdev: regulator source
40f9244f 985 * @consumer_dev_name: dev_name() string for device supply applies to
69279fb9 986 * @supply: symbolic name for supply
a5766f11
LG		 987 *
988 * Allows platform initialisation code to map physical regulator
989 * sources to symbolic names for supplies for use by devices. Devices
990 * should use these symbolic names to request regulators, avoiding the
991 * need to provide board-specific regulator names as platform data.
992 */
993static int set_consumer_device_supply(struct regulator_dev *rdev,
737f360d
MB		 994 const char *consumer_dev_name,
995 const char *supply)
a5766f11
LG		 996{
997 struct regulator_map *node;
9ed2099e 998 int has_dev;
a5766f11
LG		 999
1000 if (supply == NULL)
1001 return -EINVAL;
1002
9ed2099e
MB		 1003 if (consumer_dev_name != NULL)
1004 has_dev = 1;
1005 else
1006 has_dev = 0;
1007
6001e13c 1008 list_for_each_entry(node, &regulator_map_list, list) {
23b5cc2a
JN		 1009 if (node->dev_name && consumer_dev_name) {
1010 if (strcmp(node->dev_name, consumer_dev_name) != 0)
1011 continue;
1012 } else if (node->dev_name || consumer_dev_name) {
6001e13c 1013 continue;
23b5cc2a
JN		 1014 }
1015
6001e13c
DB		 1016 if (strcmp(node->supply, supply) != 0)
1017 continue;
1018
737f360d
MB		 1019 pr_debug("%s: %s/%s is '%s' supply; fail %s/%s\n",
1020 consumer_dev_name,
1021 dev_name(&node->regulator->dev),
1022 node->regulator->desc->name,
1023 supply,
1024 dev_name(&rdev->dev), rdev_get_name(rdev));
6001e13c
DB		 1025 return -EBUSY;
1026 }
1027
9ed2099e 1028 node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
a5766f11
LG		 1029 if (node == NULL)
1030 return -ENOMEM;
1031
1032 node->regulator = rdev;
a5766f11
LG		 1033 node->supply = supply;
1034
9ed2099e
MB		 1035 if (has_dev) {
1036 node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
1037 if (node->dev_name == NULL) {
1038 kfree(node);
1039 return -ENOMEM;
1040 }
40f9244f
MB		 1041 }
1042
a5766f11
LG		 1043 list_add(&node->list, &regulator_map_list);
1044 return 0;
1045}
1046
0f1d747b
MR		 1047static void unset_regulator_supplies(struct regulator_dev *rdev)
1048{
1049 struct regulator_map *node, *n;
1050
1051 list_for_each_entry_safe(node, n, &regulator_map_list, list) {
1052 if (rdev == node->regulator) {
1053 list_del(&node->list);
40f9244f 1054 kfree(node->dev_name);
0f1d747b 1055 kfree(node);
0f1d747b
MR		 1056 }
1057 }
1058}
1059
f5726ae3 1060#define REG_STR_SIZE 64
414c70cb
LG		 1061
1062static struct regulator *create_regulator(struct regulator_dev *rdev,
1063 struct device *dev,
1064 const char *supply_name)
1065{
1066 struct regulator *regulator;
1067 char buf[REG_STR_SIZE];
1068 int err, size;
1069
1070 regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
1071 if (regulator == NULL)
1072 return NULL;
1073
1074 mutex_lock(&rdev->mutex);
1075 regulator->rdev = rdev;
1076 list_add(&regulator->list, &rdev->consumer_list);
1077
1078 if (dev) {
e2c98eaf
SG		 1079 regulator->dev = dev;
1080
222cc7b1 1081 /* Add a link to the device sysfs entry */
414c70cb
LG		 1082 size = scnprintf(buf, REG_STR_SIZE, "%s-%s",
1083 dev->kobj.name, supply_name);
1084 if (size >= REG_STR_SIZE)
222cc7b1 1085 goto overflow_err;
414c70cb
LG		 1086
1087 regulator->supply_name = kstrdup(buf, GFP_KERNEL);
1088 if (regulator->supply_name == NULL)
222cc7b1 1089 goto overflow_err;
414c70cb
LG		 1090
1091 err = sysfs_create_link(&rdev->dev.kobj, &dev->kobj,
1092 buf);
1093 if (err) {
5da84fd9
JP		 1094 rdev_warn(rdev, "could not add device link %s err %d\n",
1095 dev->kobj.name, err);
222cc7b1 1096 /* non-fatal */
414c70cb 1097 }
5de70519
MB		 1098 } else {
1099 regulator->supply_name = kstrdup(supply_name, GFP_KERNEL);
1100 if (regulator->supply_name == NULL)
222cc7b1 1101 goto overflow_err;
5de70519
MB		 1102 }
1103
5de70519
MB		 1104 regulator->debugfs = debugfs_create_dir(regulator->supply_name,
1105 rdev->debugfs);
24751434 1106 if (!regulator->debugfs) {
5de70519 1107 rdev_warn(rdev, "Failed to create debugfs directory\n");
5de70519
MB		 1108 } else {
1109 debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1110 &regulator->uA_load);
1111 debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1112 &regulator->min_uV);
1113 debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1114 &regulator->max_uV);
414c70cb 1115 }
5de70519 1116
6492bc1b
MB		 1117 /*
1118 * Check now if the regulator is an always on regulator - if
1119 * it is then we don't need to do nearly so much work for
1120 * enable/disable calls.
1121 */
1122 if (!_regulator_can_change_status(rdev) &&
1123 _regulator_is_enabled(rdev))
1124 regulator->always_on = true;
1125
414c70cb
LG		 1126 mutex_unlock(&rdev->mutex);
1127 return regulator;
414c70cb
LG		 1128overflow_err:
1129 list_del(&regulator->list);
1130 kfree(regulator);
1131 mutex_unlock(&rdev->mutex);
1132 return NULL;
1133}
1134
31aae2be
MB		 1135static int _regulator_get_enable_time(struct regulator_dev *rdev)
1136{
1137 if (!rdev->desc->ops->enable_time)
79511ed3 1138 return rdev->desc->enable_time;
31aae2be
MB		 1139 return rdev->desc->ops->enable_time(rdev);
1140}
1141
69511a45 1142static struct regulator_dev *regulator_dev_lookup(struct device *dev,
6d191a5f
MB		 1143 const char *supply,
1144 int *ret)
69511a45
RN		 1145{
1146 struct regulator_dev *r;
1147 struct device_node *node;
576ca436
MB		 1148 struct regulator_map *map;
1149 const char *devname = NULL;
69511a45
RN		 1150
1151 /* first do a dt based lookup */
1152 if (dev && dev->of_node) {
1153 node = of_get_regulator(dev, supply);
6d191a5f 1154 if (node) {
69511a45
RN		 1155 list_for_each_entry(r, &regulator_list, list)
1156 if (r->dev.parent &&
1157 node == r->dev.of_node)
1158 return r;
6d191a5f
MB		 1159 } else {
1160 /*
1161 * If we couldn't even get the node then it's
1162 * not just that the device didn't register
1163 * yet, there's no node and we'll never
1164 * succeed.
1165 */
1166 *ret = -ENODEV;
1167 }
69511a45
RN		 1168 }
1169
1170 /* if not found, try doing it non-dt way */
576ca436
MB		 1171 if (dev)
1172 devname = dev_name(dev);
1173
69511a45
RN		 1174 list_for_each_entry(r, &regulator_list, list)
1175 if (strcmp(rdev_get_name(r), supply) == 0)
1176 return r;
1177
576ca436
MB		 1178 list_for_each_entry(map, &regulator_map_list, list) {
1179 /* If the mapping has a device set up it must match */
1180 if (map->dev_name &&
1181 (!devname || strcmp(map->dev_name, devname)))
1182 continue;
1183
1184 if (strcmp(map->supply, supply) == 0)
1185 return map->regulator;
1186 }
1187
1188
69511a45
RN		 1189 return NULL;
1190}
1191
5ffbd136
MB		 1192/* Internal regulator request function */
1193static struct regulator *_regulator_get(struct device *dev, const char *id,
1194 int exclusive)
414c70cb
LG		 1195{
1196 struct regulator_dev *rdev;
04bf3011 1197 struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
40f9244f 1198 const char *devname = NULL;
5ffbd136 1199 int ret;
414c70cb
LG		 1200
1201 if (id == NULL) {
5da84fd9 1202 pr_err("get() with no identifier\n");
414c70cb
LG		 1203 return regulator;
1204 }
1205
40f9244f
MB		 1206 if (dev)
1207 devname = dev_name(dev);
1208
414c70cb
LG		 1209 mutex_lock(&regulator_list_mutex);
1210
6d191a5f 1211 rdev = regulator_dev_lookup(dev, id, &ret);
69511a45
RN		 1212 if (rdev)
1213 goto found;
1214
688fe99a
MB		 1215 if (board_wants_dummy_regulator) {
1216 rdev = dummy_regulator_rdev;
1217 goto found;
1218 }
1219
34abbd68
MB		 1220#ifdef CONFIG_REGULATOR_DUMMY
1221 if (!devname)
1222 devname = "deviceless";
1223
1224 /* If the board didn't flag that it was fully constrained then
1225 * substitute in a dummy regulator so consumers can continue.
1226 */
1227 if (!has_full_constraints) {
5da84fd9
JP		 1228 pr_warn("%s supply %s not found, using dummy regulator\n",
1229 devname, id);
34abbd68
MB		 1230 rdev = dummy_regulator_rdev;
1231 goto found;
1232 }
1233#endif
1234
414c70cb
LG		 1235 mutex_unlock(&regulator_list_mutex);
1236 return regulator;
1237
1238found:
5ffbd136
MB		 1239 if (rdev->exclusive) {
1240 regulator = ERR_PTR(-EPERM);
1241 goto out;
1242 }
1243
1244 if (exclusive && rdev->open_count) {
1245 regulator = ERR_PTR(-EBUSY);
1246 goto out;
1247 }
1248
a5766f11
LG		 1249 if (!try_module_get(rdev->owner))
1250 goto out;
1251
414c70cb
LG		 1252 regulator = create_regulator(rdev, dev, id);
1253 if (regulator == NULL) {
1254 regulator = ERR_PTR(-ENOMEM);
1255 module_put(rdev->owner);
bcda4321 1256 goto out;
414c70cb
LG		 1257 }
1258
5ffbd136
MB		 1259 rdev->open_count++;
1260 if (exclusive) {
1261 rdev->exclusive = 1;
1262
1263 ret = _regulator_is_enabled(rdev);
1264 if (ret > 0)
1265 rdev->use_count = 1;
1266 else
1267 rdev->use_count = 0;
1268 }
1269
a5766f11 1270out:
414c70cb 1271 mutex_unlock(&regulator_list_mutex);
5ffbd136 1272
414c70cb
LG		 1273 return regulator;
1274}
5ffbd136
MB		 1275
1276/**
1277 * regulator_get - lookup and obtain a reference to a regulator.
1278 * @dev: device for regulator "consumer"
1279 * @id: Supply name or regulator ID.
1280 *
1281 * Returns a struct regulator corresponding to the regulator producer,
1282 * or IS_ERR() condition containing errno.
1283 *
1284 * Use of supply names configured via regulator_set_device_supply() is
1285 * strongly encouraged. It is recommended that the supply name used
1286 * should match the name used for the supply and/or the relevant
1287 * device pins in the datasheet.
1288 */
1289struct regulator *regulator_get(struct device *dev, const char *id)
1290{
1291 return _regulator_get(dev, id, 0);
1292}
414c70cb
LG		 1293EXPORT_SYMBOL_GPL(regulator_get);
1294
070b9079
SB		 1295static void devm_regulator_release(struct device *dev, void *res)
1296{
1297 regulator_put(*(struct regulator **)res);
1298}
1299
1300/**
1301 * devm_regulator_get - Resource managed regulator_get()
1302 * @dev: device for regulator "consumer"
1303 * @id: Supply name or regulator ID.
1304 *
1305 * Managed regulator_get(). Regulators returned from this function are
1306 * automatically regulator_put() on driver detach. See regulator_get() for more
1307 * information.
1308 */
1309struct regulator *devm_regulator_get(struct device *dev, const char *id)
1310{
1311 struct regulator **ptr, *regulator;
1312
1313 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
1314 if (!ptr)
1315 return ERR_PTR(-ENOMEM);
1316
1317 regulator = regulator_get(dev, id);
1318 if (!IS_ERR(regulator)) {
1319 *ptr = regulator;
1320 devres_add(dev, ptr);
1321 } else {
1322 devres_free(ptr);
1323 }
1324
1325 return regulator;
1326}
1327EXPORT_SYMBOL_GPL(devm_regulator_get);
1328
5ffbd136
MB		 1329/**
1330 * regulator_get_exclusive - obtain exclusive access to a regulator.
1331 * @dev: device for regulator "consumer"
1332 * @id: Supply name or regulator ID.
1333 *
1334 * Returns a struct regulator corresponding to the regulator producer,
1335 * or IS_ERR() condition containing errno. Other consumers will be
1336 * unable to obtain this reference is held and the use count for the
1337 * regulator will be initialised to reflect the current state of the
1338 * regulator.
1339 *
1340 * This is intended for use by consumers which cannot tolerate shared
1341 * use of the regulator such as those which need to force the
1342 * regulator off for correct operation of the hardware they are
1343 * controlling.
1344 *
1345 * Use of supply names configured via regulator_set_device_supply() is
1346 * strongly encouraged. It is recommended that the supply name used
1347 * should match the name used for the supply and/or the relevant
1348 * device pins in the datasheet.
1349 */
1350struct regulator *regulator_get_exclusive(struct device *dev, const char *id)
1351{
1352 return _regulator_get(dev, id, 1);
1353}
1354EXPORT_SYMBOL_GPL(regulator_get_exclusive);
1355
414c70cb
LG		 1356/**
1357 * regulator_put - "free" the regulator source
1358 * @regulator: regulator source
1359 *
1360 * Note: drivers must ensure that all regulator_enable calls made on this
1361 * regulator source are balanced by regulator_disable calls prior to calling
1362 * this function.
1363 */
1364void regulator_put(struct regulator *regulator)
1365{
1366 struct regulator_dev *rdev;
1367
1368 if (regulator == NULL || IS_ERR(regulator))
1369 return;
1370
414c70cb
LG		 1371 mutex_lock(&regulator_list_mutex);
1372 rdev = regulator->rdev;
1373
5de70519 1374 debugfs_remove_recursive(regulator->debugfs);
5de70519 1375
414c70cb 1376 /* remove any sysfs entries */
e2c98eaf 1377 if (regulator->dev)
414c70cb 1378 sysfs_remove_link(&rdev->dev.kobj, regulator->supply_name);
5de70519 1379 kfree(regulator->supply_name);
414c70cb
LG		 1380 list_del(&regulator->list);
1381 kfree(regulator);
1382
5ffbd136
MB		 1383 rdev->open_count--;
1384 rdev->exclusive = 0;
1385
414c70cb
LG		 1386 module_put(rdev->owner);
1387 mutex_unlock(&regulator_list_mutex);
1388}
1389EXPORT_SYMBOL_GPL(regulator_put);
1390
d5ad34f7
MB		 1391static int devm_regulator_match(struct device *dev, void *res, void *data)
1392{
1393 struct regulator **r = res;
1394 if (!r || !*r) {
1395 WARN_ON(!r || !*r);
1396 return 0;
1397 }
1398 return *r == data;
1399}
1400
1401/**
1402 * devm_regulator_put - Resource managed regulator_put()
1403 * @regulator: regulator to free
1404 *
1405 * Deallocate a regulator allocated with devm_regulator_get(). Normally
1406 * this function will not need to be called and the resource management
1407 * code will ensure that the resource is freed.
1408 */
1409void devm_regulator_put(struct regulator *regulator)
1410{
1411 int rc;
1412
361ff501 1413 rc = devres_release(regulator->dev, devm_regulator_release,
d5ad34f7 1414 devm_regulator_match, regulator);
230a5a1c 1415 if (rc != 0)
968c2c17 1416 WARN_ON(rc);
d5ad34f7
MB		 1417}
1418EXPORT_SYMBOL_GPL(devm_regulator_put);
1419
5c5659d0
MB		 1420static int _regulator_do_enable(struct regulator_dev *rdev)
1421{
1422 int ret, delay;
1423
1424 /* Query before enabling in case configuration dependent. */
1425 ret = _regulator_get_enable_time(rdev);
1426 if (ret >= 0) {
1427 delay = ret;
1428 } else {
1429 rdev_warn(rdev, "enable_time() failed: %d\n", ret);
1430 delay = 0;
1431 }
1432
1433 trace_regulator_enable(rdev_get_name(rdev));
1434
65f73508
MB		 1435 if (rdev->ena_gpio) {
1436 gpio_set_value_cansleep(rdev->ena_gpio,
1437 !rdev->ena_gpio_invert);
1438 rdev->ena_gpio_state = 1;
1439 } else if (rdev->desc->ops->enable) {
5c5659d0
MB		 1440 ret = rdev->desc->ops->enable(rdev);
1441 if (ret < 0)
1442 return ret;
1443 } else {
1444 return -EINVAL;
1445 }
1446
1447 /* Allow the regulator to ramp; it would be useful to extend
1448 * this for bulk operations so that the regulators can ramp
1449 * together. */
1450 trace_regulator_enable_delay(rdev_get_name(rdev));
1451
1452 if (delay >= 1000) {
1453 mdelay(delay / 1000);
1454 udelay(delay % 1000);
1455 } else if (delay) {
1456 udelay(delay);
1457 }
1458
1459 trace_regulator_enable_complete(rdev_get_name(rdev));
1460
1461 return 0;
1462}
1463
414c70cb
LG		 1464/* locks held by regulator_enable() */
1465static int _regulator_enable(struct regulator_dev *rdev)
1466{
5c5659d0 1467 int ret;
414c70cb 1468
414c70cb 1469 /* check voltage and requested load before enabling */
9a2372fa
MB		 1470 if (rdev->constraints &&
1471 (rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_DRMS))
1472 drms_uA_update(rdev);
414c70cb 1473
9a2372fa
MB		 1474 if (rdev->use_count == 0) {
1475 /* The regulator may on if it's not switchable or left on */
1476 ret = _regulator_is_enabled(rdev);
1477 if (ret == -EINVAL || ret == 0) {
1478 if (!_regulator_can_change_status(rdev))
1479 return -EPERM;
1480
5c5659d0 1481 ret = _regulator_do_enable(rdev);
31aae2be
MB		 1482 if (ret < 0)
1483 return ret;
1484
a7433cff 1485 } else if (ret < 0) {
5da84fd9 1486 rdev_err(rdev, "is_enabled() failed: %d\n", ret);
414c70cb
LG		 1487 return ret;
1488 }
a7433cff 1489 /* Fallthrough on positive return values - already enabled */
414c70cb
LG		 1490 }
1491
9a2372fa
MB		 1492 rdev->use_count++;
1493
1494 return 0;
414c70cb
LG		 1495}
1496
1497/**
1498 * regulator_enable - enable regulator output
1499 * @regulator: regulator source
1500 *
cf7bbcdf
MB		 1501 * Request that the regulator be enabled with the regulator output at
1502 * the predefined voltage or current value. Calls to regulator_enable()
1503 * must be balanced with calls to regulator_disable().
1504 *
414c70cb 1505 * NOTE: the output value can be set by other drivers, boot loader or may be
cf7bbcdf 1506 * hardwired in the regulator.
414c70cb
LG		 1507 */
1508int regulator_enable(struct regulator *regulator)
1509{
412aec61
DB		 1510 struct regulator_dev *rdev = regulator->rdev;
1511 int ret = 0;
414c70cb 1512
6492bc1b
MB		 1513 if (regulator->always_on)
1514 return 0;
1515
3801b86a
MB		 1516 if (rdev->supply) {
1517 ret = regulator_enable(rdev->supply);
1518 if (ret != 0)
1519 return ret;
1520 }
1521
412aec61 1522 mutex_lock(&rdev->mutex);
cd94b505 1523 ret = _regulator_enable(rdev);
412aec61 1524 mutex_unlock(&rdev->mutex);
3801b86a 1525
d1685e4e 1526 if (ret != 0 && rdev->supply)
3801b86a
MB		 1527 regulator_disable(rdev->supply);
1528
414c70cb
LG		 1529 return ret;
1530}
1531EXPORT_SYMBOL_GPL(regulator_enable);
1532
5c5659d0
MB		 1533static int _regulator_do_disable(struct regulator_dev *rdev)
1534{
1535 int ret;
1536
1537 trace_regulator_disable(rdev_get_name(rdev));
1538
1539 if (rdev->ena_gpio) {
1540 gpio_set_value_cansleep(rdev->ena_gpio,
1541 rdev->ena_gpio_invert);
1542 rdev->ena_gpio_state = 0;
1543
1544 } else if (rdev->desc->ops->disable) {
1545 ret = rdev->desc->ops->disable(rdev);
1546 if (ret != 0)
1547 return ret;
1548 }
1549
1550 trace_regulator_disable_complete(rdev_get_name(rdev));
1551
1552 _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
1553 NULL);
1554 return 0;
1555}
1556
414c70cb 1557/* locks held by regulator_disable() */
3801b86a 1558static int _regulator_disable(struct regulator_dev *rdev)
414c70cb
LG		 1559{
1560 int ret = 0;
1561
cd94b505 1562 if (WARN(rdev->use_count <= 0,
43e7ee33 1563 "unbalanced disables for %s\n", rdev_get_name(rdev)))
cd94b505
DB		 1564 return -EIO;
1565
414c70cb 1566 /* are we the last user and permitted to disable ? */
60ef66fc
MB		 1567 if (rdev->use_count == 1 &&
1568 (rdev->constraints && !rdev->constraints->always_on)) {
414c70cb
LG		 1569
1570 /* we are last user */
5c5659d0
MB		 1571 if (_regulator_can_change_status(rdev)) {
1572 ret = _regulator_do_disable(rdev);
414c70cb 1573 if (ret < 0) {
5da84fd9 1574 rdev_err(rdev, "failed to disable\n");
414c70cb
LG		 1575 return ret;
1576 }
1577 }
1578
414c70cb
LG		 1579 rdev->use_count = 0;
1580 } else if (rdev->use_count > 1) {
1581
1582 if (rdev->constraints &&
1583 (rdev->constraints->valid_ops_mask &
1584 REGULATOR_CHANGE_DRMS))
1585 drms_uA_update(rdev);
1586
1587 rdev->use_count--;
1588 }
3801b86a 1589
414c70cb
LG		 1590 return ret;
1591}
1592
1593/**
1594 * regulator_disable - disable regulator output
1595 * @regulator: regulator source
1596 *
cf7bbcdf
MB		 1597 * Disable the regulator output voltage or current. Calls to
1598 * regulator_enable() must be balanced with calls to
1599 * regulator_disable().
69279fb9 1600 *
414c70cb 1601 * NOTE: this will only disable the regulator output if no other consumer
cf7bbcdf
MB		 1602 * devices have it enabled, the regulator device supports disabling and
1603 * machine constraints permit this operation.
414c70cb
LG		 1604 */
1605int regulator_disable(struct regulator *regulator)
1606{
412aec61
DB		 1607 struct regulator_dev *rdev = regulator->rdev;
1608 int ret = 0;
414c70cb 1609
6492bc1b
MB		 1610 if (regulator->always_on)
1611 return 0;
1612
412aec61 1613 mutex_lock(&rdev->mutex);
3801b86a 1614 ret = _regulator_disable(rdev);
412aec61 1615 mutex_unlock(&rdev->mutex);
8cbf811d 1616
3801b86a
MB		 1617 if (ret == 0 && rdev->supply)
1618 regulator_disable(rdev->supply);
8cbf811d 1619
414c70cb
LG		 1620 return ret;
1621}
1622EXPORT_SYMBOL_GPL(regulator_disable);
1623
1624/* locks held by regulator_force_disable() */
3801b86a 1625static int _regulator_force_disable(struct regulator_dev *rdev)
414c70cb
LG		 1626{
1627 int ret = 0;
1628
1629 /* force disable */
1630 if (rdev->desc->ops->disable) {
1631 /* ah well, who wants to live forever... */
1632 ret = rdev->desc->ops->disable(rdev);
1633 if (ret < 0) {
5da84fd9 1634 rdev_err(rdev, "failed to force disable\n");
414c70cb
LG		 1635 return ret;
1636 }
1637 /* notify other consumers that power has been forced off */
84b68263
MB		 1638 _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
1639 REGULATOR_EVENT_DISABLE, NULL);
414c70cb
LG		 1640 }
1641
414c70cb
LG		 1642 return ret;
1643}
1644
1645/**
1646 * regulator_force_disable - force disable regulator output
1647 * @regulator: regulator source
1648 *
1649 * Forcibly disable the regulator output voltage or current.
1650 * NOTE: this *will* disable the regulator output even if other consumer
1651 * devices have it enabled. This should be used for situations when device
1652 * damage will likely occur if the regulator is not disabled (e.g. over temp).
1653 */
1654int regulator_force_disable(struct regulator *regulator)
1655{
82d15839 1656 struct regulator_dev *rdev = regulator->rdev;
414c70cb
LG		 1657 int ret;
1658
82d15839 1659 mutex_lock(&rdev->mutex);
414c70cb 1660 regulator->uA_load = 0;
3801b86a 1661 ret = _regulator_force_disable(regulator->rdev);
82d15839 1662 mutex_unlock(&rdev->mutex);
8cbf811d 1663
3801b86a
MB		 1664 if (rdev->supply)
1665 while (rdev->open_count--)
1666 regulator_disable(rdev->supply);
8cbf811d 1667
414c70cb
LG		 1668 return ret;
1669}
1670EXPORT_SYMBOL_GPL(regulator_force_disable);
1671
da07ecd9
MB		 1672static void regulator_disable_work(struct work_struct *work)
1673{
1674 struct regulator_dev *rdev = container_of(work, struct regulator_dev,
1675 disable_work.work);
1676 int count, i, ret;
1677
1678 mutex_lock(&rdev->mutex);
1679
1680 BUG_ON(!rdev->deferred_disables);
1681
1682 count = rdev->deferred_disables;
1683 rdev->deferred_disables = 0;
1684
1685 for (i = 0; i < count; i++) {
1686 ret = _regulator_disable(rdev);
1687 if (ret != 0)
1688 rdev_err(rdev, "Deferred disable failed: %d\n", ret);
1689 }
1690
1691 mutex_unlock(&rdev->mutex);
1692
1693 if (rdev->supply) {
1694 for (i = 0; i < count; i++) {
1695 ret = regulator_disable(rdev->supply);
1696 if (ret != 0) {
1697 rdev_err(rdev,
1698 "Supply disable failed: %d\n", ret);
1699 }
1700 }
1701 }
1702}
1703
1704/**
1705 * regulator_disable_deferred - disable regulator output with delay
1706 * @regulator: regulator source
1707 * @ms: miliseconds until the regulator is disabled
1708 *
1709 * Execute regulator_disable() on the regulator after a delay. This
1710 * is intended for use with devices that require some time to quiesce.
1711 *
1712 * NOTE: this will only disable the regulator output if no other consumer
1713 * devices have it enabled, the regulator device supports disabling and
1714 * machine constraints permit this operation.
1715 */
1716int regulator_disable_deferred(struct regulator *regulator, int ms)
1717{
1718 struct regulator_dev *rdev = regulator->rdev;
aa59802d 1719 int ret;
da07ecd9 1720
6492bc1b
MB		 1721 if (regulator->always_on)
1722 return 0;
1723
da07ecd9
MB		 1724 mutex_lock(&rdev->mutex);
1725 rdev->deferred_disables++;
1726 mutex_unlock(&rdev->mutex);
1727
aa59802d
MB		 1728 ret = schedule_delayed_work(&rdev->disable_work,
1729 msecs_to_jiffies(ms));
1730 if (ret < 0)
1731 return ret;
1732 else
1733 return 0;
da07ecd9
MB		 1734}
1735EXPORT_SYMBOL_GPL(regulator_disable_deferred);
1736
cd6dffb4
MB		 1737/**
1738 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
1739 *
1740 * @rdev: regulator to operate on
1741 *
1742 * Regulators that use regmap for their register I/O can set the
1743 * enable_reg and enable_mask fields in their descriptor and then use
1744 * this as their is_enabled operation, saving some code.
1745 */
1746int regulator_is_enabled_regmap(struct regulator_dev *rdev)
1747{
1748 unsigned int val;
1749 int ret;
1750
1751 ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
1752 if (ret != 0)
1753 return ret;
1754
1755 return (val & rdev->desc->enable_mask) != 0;
1756}
1757EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
1758
1759/**
1760 * regulator_enable_regmap - standard enable() for regmap users
1761 *
1762 * @rdev: regulator to operate on
1763 *
1764 * Regulators that use regmap for their register I/O can set the
1765 * enable_reg and enable_mask fields in their descriptor and then use
1766 * this as their enable() operation, saving some code.
1767 */
1768int regulator_enable_regmap(struct regulator_dev *rdev)
1769{
1770 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1771 rdev->desc->enable_mask,
1772 rdev->desc->enable_mask);
1773}
1774EXPORT_SYMBOL_GPL(regulator_enable_regmap);
1775
1776/**
1777 * regulator_disable_regmap - standard disable() for regmap users
1778 *
1779 * @rdev: regulator to operate on
1780 *
1781 * Regulators that use regmap for their register I/O can set the
1782 * enable_reg and enable_mask fields in their descriptor and then use
1783 * this as their disable() operation, saving some code.
1784 */
1785int regulator_disable_regmap(struct regulator_dev *rdev)
1786{
1787 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
1788 rdev->desc->enable_mask, 0);
1789}
1790EXPORT_SYMBOL_GPL(regulator_disable_regmap);
1791
414c70cb
LG		 1792static int _regulator_is_enabled(struct regulator_dev *rdev)
1793{
65f73508
MB		 1794 /* A GPIO control always takes precedence */
1795 if (rdev->ena_gpio)
1796 return rdev->ena_gpio_state;
1797
9a7f6a4c 1798 /* If we don't know then assume that the regulator is always on */
9332546f 1799 if (!rdev->desc->ops->is_enabled)
9a7f6a4c 1800 return 1;
414c70cb 1801
9332546f 1802 return rdev->desc->ops->is_enabled(rdev);
414c70cb
LG		 1803}
1804
1805/**
1806 * regulator_is_enabled - is the regulator output enabled
1807 * @regulator: regulator source
1808 *
412aec61
DB		 1809 * Returns positive if the regulator driver backing the source/client
1810 * has requested that the device be enabled, zero if it hasn't, else a
1811 * negative errno code.
1812 *
1813 * Note that the device backing this regulator handle can have multiple
1814 * users, so it might be enabled even if regulator_enable() was never
1815 * called for this particular source.
414c70cb
LG		 1816 */
1817int regulator_is_enabled(struct regulator *regulator)
1818{
9332546f
MB		 1819 int ret;
1820
6492bc1b
MB		 1821 if (regulator->always_on)
1822 return 1;
1823
9332546f
MB		 1824 mutex_lock(&regulator->rdev->mutex);
1825 ret = _regulator_is_enabled(regulator->rdev);
1826 mutex_unlock(&regulator->rdev->mutex);
1827
1828 return ret;
414c70cb
LG		 1829}
1830EXPORT_SYMBOL_GPL(regulator_is_enabled);
1831
4367cfdc
DB		 1832/**
1833 * regulator_count_voltages - count regulator_list_voltage() selectors
1834 * @regulator: regulator source
1835 *
1836 * Returns number of selectors, or negative errno. Selectors are
1837 * numbered starting at zero, and typically correspond to bitfields
1838 * in hardware registers.
1839 */
1840int regulator_count_voltages(struct regulator *regulator)
1841{
1842 struct regulator_dev *rdev = regulator->rdev;
1843
1844 return rdev->desc->n_voltages ? : -EINVAL;
1845}
1846EXPORT_SYMBOL_GPL(regulator_count_voltages);
1847
bca7bbff
MB		 1848/**
1849 * regulator_list_voltage_linear - List voltages with simple calculation
1850 *
1851 * @rdev: Regulator device
1852 * @selector: Selector to convert into a voltage
1853 *
1854 * Regulators with a simple linear mapping between voltages and
1855 * selectors can set min_uV and uV_step in the regulator descriptor
1856 * and then use this function as their list_voltage() operation,
1857 */
1858int regulator_list_voltage_linear(struct regulator_dev *rdev,
1859 unsigned int selector)
1860{
1861 if (selector >= rdev->desc->n_voltages)
1862 return -EINVAL;
1863
1864 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
1865}
1866EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
1867
cffc9592
AL		 1868/**
1869 * regulator_list_voltage_table - List voltages with table based mapping
1870 *
1871 * @rdev: Regulator device
1872 * @selector: Selector to convert into a voltage
1873 *
1874 * Regulators with table based mapping between voltages and
1875 * selectors can set volt_table in the regulator descriptor
1876 * and then use this function as their list_voltage() operation.
1877 */
1878int regulator_list_voltage_table(struct regulator_dev *rdev,
1879 unsigned int selector)
1880{
1881 if (!rdev->desc->volt_table) {
1882 BUG_ON(!rdev->desc->volt_table);
1883 return -EINVAL;
1884 }
1885
1886 if (selector >= rdev->desc->n_voltages)
1887 return -EINVAL;
1888
1889 return rdev->desc->volt_table[selector];
1890}
1891EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
1892
4367cfdc
DB		 1893/**
1894 * regulator_list_voltage - enumerate supported voltages
1895 * @regulator: regulator source
1896 * @selector: identify voltage to list
1897 * Context: can sleep
1898 *
1899 * Returns a voltage that can be passed to @regulator_set_voltage(),
88393161 1900 * zero if this selector code can't be used on this system, or a
4367cfdc
DB		 1901 * negative errno.
1902 */
1903int regulator_list_voltage(struct regulator *regulator, unsigned selector)
1904{
1905 struct regulator_dev *rdev = regulator->rdev;
1906 struct regulator_ops *ops = rdev->desc->ops;
1907 int ret;
1908
1909 if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
1910 return -EINVAL;
1911
1912 mutex_lock(&rdev->mutex);
1913 ret = ops->list_voltage(rdev, selector);
1914 mutex_unlock(&rdev->mutex);
1915
1916 if (ret > 0) {
1917 if (ret < rdev->constraints->min_uV)
1918 ret = 0;
1919 else if (ret > rdev->constraints->max_uV)
1920 ret = 0;
1921 }
1922
1923 return ret;
1924}
1925EXPORT_SYMBOL_GPL(regulator_list_voltage);
1926
a7a1ad90
MB		 1927/**
1928 * regulator_is_supported_voltage - check if a voltage range can be supported
1929 *
1930 * @regulator: Regulator to check.
1931 * @min_uV: Minimum required voltage in uV.
1932 * @max_uV: Maximum required voltage in uV.
1933 *
1934 * Returns a boolean or a negative error code.
1935 */
1936int regulator_is_supported_voltage(struct regulator *regulator,
1937 int min_uV, int max_uV)
1938{
c5f3939b 1939 struct regulator_dev *rdev = regulator->rdev;
a7a1ad90
MB		 1940 int i, voltages, ret;
1941
c5f3939b
MB		 1942 /* If we can't change voltage check the current voltage */
1943 if (!(rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE)) {
1944 ret = regulator_get_voltage(regulator);
1945 if (ret >= 0)
1946 return (min_uV >= ret && ret <= max_uV);
1947 else
1948 return ret;
1949 }
1950
a7a1ad90
MB		 1951 ret = regulator_count_voltages(regulator);
1952 if (ret < 0)
1953 return ret;
1954 voltages = ret;
1955
1956 for (i = 0; i < voltages; i++) {
1957 ret = regulator_list_voltage(regulator, i);
1958
1959 if (ret >= min_uV && ret <= max_uV)
1960 return 1;
1961 }
1962
1963 return 0;
1964}
a398eaa2 1965EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
a7a1ad90 1966
4ab5b3d9
MB		 1967/**
1968 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
1969 *
1970 * @rdev: regulator to operate on
1971 *
1972 * Regulators that use regmap for their register I/O can set the
1973 * vsel_reg and vsel_mask fields in their descriptor and then use this
1974 * as their get_voltage_vsel operation, saving some code.
1975 */
1976int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
1977{
1978 unsigned int val;
1979 int ret;
1980
1981 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
1982 if (ret != 0)
1983 return ret;
1984
1985 val &= rdev->desc->vsel_mask;
1986 val >>= ffs(rdev->desc->vsel_mask) - 1;
1987
1988 return val;
1989}
1990EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
1991
1992/**
1993 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
1994 *
1995 * @rdev: regulator to operate on
1996 * @sel: Selector to set
1997 *
1998 * Regulators that use regmap for their register I/O can set the
1999 * vsel_reg and vsel_mask fields in their descriptor and then use this
2000 * as their set_voltage_vsel operation, saving some code.
2001 */
2002int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
2003{
2004 sel <<= ffs(rdev->desc->vsel_mask) - 1;
2005
2006 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
2007 rdev->desc->vsel_mask, sel);
2008}
2009EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
2010
e843fc46
MB		 2011/**
2012 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
2013 *
2014 * @rdev: Regulator to operate on
2015 * @min_uV: Lower bound for voltage
2016 * @max_uV: Upper bound for voltage
2017 *
2018 * Drivers implementing set_voltage_sel() and list_voltage() can use
2019 * this as their map_voltage() operation. It will find a suitable
2020 * voltage by calling list_voltage() until it gets something in bounds
2021 * for the requested voltages.
2022 */
2023int regulator_map_voltage_iterate(struct regulator_dev *rdev,
2024 int min_uV, int max_uV)
2025{
2026 int best_val = INT_MAX;
2027 int selector = 0;
2028 int i, ret;
2029
2030 /* Find the smallest voltage that falls within the specified
2031 * range.
2032 */
2033 for (i = 0; i < rdev->desc->n_voltages; i++) {
2034 ret = rdev->desc->ops->list_voltage(rdev, i);
2035 if (ret < 0)
2036 continue;
2037
2038 if (ret < best_val && ret >= min_uV && ret <= max_uV) {
2039 best_val = ret;
2040 selector = i;
2041 }
2042 }
2043
2044 if (best_val != INT_MAX)
2045 return selector;
2046 else
2047 return -EINVAL;
2048}
2049EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
2050
bca7bbff
MB		 2051/**
2052 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
2053 *
2054 * @rdev: Regulator to operate on
2055 * @min_uV: Lower bound for voltage
2056 * @max_uV: Upper bound for voltage
2057 *
2058 * Drivers providing min_uV and uV_step in their regulator_desc can
2059 * use this as their map_voltage() operation.
2060 */
2061int regulator_map_voltage_linear(struct regulator_dev *rdev,
2062 int min_uV, int max_uV)
2063{
2064 int ret, voltage;
2065
5a6881e8
AL		 2066 /* Allow uV_step to be 0 for fixed voltage */
2067 if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
2068 if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
2069 return 0;
2070 else
2071 return -EINVAL;
2072 }
2073
bca7bbff
MB		 2074 if (!rdev->desc->uV_step) {
2075 BUG_ON(!rdev->desc->uV_step);
2076 return -EINVAL;
2077 }
2078
0bdc81e4
AL		 2079 if (min_uV < rdev->desc->min_uV)
2080 min_uV = rdev->desc->min_uV;
2081
ccfcb1c3 2082 ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
bca7bbff
MB		 2083 if (ret < 0)
2084 return ret;
2085
2086 /* Map back into a voltage to verify we're still in bounds */
2087 voltage = rdev->desc->ops->list_voltage(rdev, ret);
2088 if (voltage < min_uV || voltage > max_uV)
2089 return -EINVAL;
2090
2091 return ret;
2092}
2093EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
2094
75790251
MB		 2095static int _regulator_do_set_voltage(struct regulator_dev *rdev,
2096 int min_uV, int max_uV)
2097{
2098 int ret;
77af1b26 2099 int delay = 0;
e113d792 2100 int best_val = 0;
75790251 2101 unsigned int selector;
eba41a5e 2102 int old_selector = -1;
75790251
MB		 2103
2104 trace_regulator_set_voltage(rdev_get_name(rdev), min_uV, max_uV);
2105
bf5892a8
MB		 2106 min_uV += rdev->constraints->uV_offset;
2107 max_uV += rdev->constraints->uV_offset;
2108
eba41a5e
AL		 2109 /*
2110 * If we can't obtain the old selector there is not enough
2111 * info to call set_voltage_time_sel().
2112 */
8b7485ef
AL		 2113 if (_regulator_is_enabled(rdev) &&
2114 rdev->desc->ops->set_voltage_time_sel &&
eba41a5e
AL		 2115 rdev->desc->ops->get_voltage_sel) {
2116 old_selector = rdev->desc->ops->get_voltage_sel(rdev);
2117 if (old_selector < 0)
2118 return old_selector;
2119 }
2120
75790251
MB		 2121 if (rdev->desc->ops->set_voltage) {
2122 ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
2123 &selector);
e113d792
MB		 2124
2125 if (ret >= 0) {
2126 if (rdev->desc->ops->list_voltage)
2127 best_val = rdev->desc->ops->list_voltage(rdev,
2128 selector);
2129 else
2130 best_val = _regulator_get_voltage(rdev);
2131 }
2132
e8eef82b 2133 } else if (rdev->desc->ops->set_voltage_sel) {
9152c36a 2134 if (rdev->desc->ops->map_voltage) {
e843fc46
MB		 2135 ret = rdev->desc->ops->map_voltage(rdev, min_uV,
2136 max_uV);
9152c36a
AL		 2137 } else {
2138 if (rdev->desc->ops->list_voltage ==
2139 regulator_list_voltage_linear)
2140 ret = regulator_map_voltage_linear(rdev,
2141 min_uV, max_uV);
2142 else
2143 ret = regulator_map_voltage_iterate(rdev,
2144 min_uV, max_uV);
2145 }
e8eef82b 2146
e843fc46 2147 if (ret >= 0) {
e113d792
MB		 2148 best_val = rdev->desc->ops->list_voltage(rdev, ret);
2149 if (min_uV <= best_val && max_uV >= best_val) {
2150 selector = ret;
2151 ret = rdev->desc->ops->set_voltage_sel(rdev,
2152 ret);
2153 } else {
2154 ret = -EINVAL;
2155 }
e8eef82b 2156 }
75790251
MB		 2157 } else {
2158 ret = -EINVAL;
2159 }
e8eef82b 2160
eba41a5e 2161 /* Call set_voltage_time_sel if successfully obtained old_selector */
5aff3a8b 2162 if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
eba41a5e 2163 rdev->desc->ops->set_voltage_time_sel) {
77af1b26 2164
eba41a5e
AL		 2165 delay = rdev->desc->ops->set_voltage_time_sel(rdev,
2166 old_selector, selector);
2167 if (delay < 0) {
2168 rdev_warn(rdev, "set_voltage_time_sel() failed: %d\n",
2169 delay);
2170 delay = 0;
e8eef82b 2171 }
75790251 2172
8b96de31
PR		 2173 /* Insert any necessary delays */
2174 if (delay >= 1000) {
2175 mdelay(delay / 1000);
2176 udelay(delay % 1000);
2177 } else if (delay) {
2178 udelay(delay);
2179 }
77af1b26
LW		 2180 }
2181
2f6c797f
AL		 2182 if (ret == 0 && best_val >= 0) {
2183 unsigned long data = best_val;
2184
ded06a52 2185 _notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
2f6c797f
AL		 2186 (void *)data);
2187 }
ded06a52 2188
eba41a5e 2189 trace_regulator_set_voltage_complete(rdev_get_name(rdev), best_val);
75790251
MB		 2190
2191 return ret;
2192}
2193
414c70cb
LG		 2194/**
2195 * regulator_set_voltage - set regulator output voltage
2196 * @regulator: regulator source
2197 * @min_uV: Minimum required voltage in uV
2198 * @max_uV: Maximum acceptable voltage in uV
2199 *
2200 * Sets a voltage regulator to the desired output voltage. This can be set
2201 * during any regulator state. IOW, regulator can be disabled or enabled.
2202 *
2203 * If the regulator is enabled then the voltage will change to the new value
2204 * immediately otherwise if the regulator is disabled the regulator will
2205 * output at the new voltage when enabled.
2206 *
2207 * NOTE: If the regulator is shared between several devices then the lowest
2208 * request voltage that meets the system constraints will be used.
69279fb9 2209 * Regulator system constraints must be set for this regulator before
414c70cb
LG		 2210 * calling this function otherwise this call will fail.
2211 */
2212int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
2213{
2214 struct regulator_dev *rdev = regulator->rdev;
95a3c23a 2215 int ret = 0;
414c70cb
LG		 2216
2217 mutex_lock(&rdev->mutex);
2218
95a3c23a
MB		 2219 /* If we're setting the same range as last time the change
2220 * should be a noop (some cpufreq implementations use the same
2221 * voltage for multiple frequencies, for example).
2222 */
2223 if (regulator->min_uV == min_uV && regulator->max_uV == max_uV)
2224 goto out;
2225
414c70cb 2226 /* sanity check */
e8eef82b
MB		 2227 if (!rdev->desc->ops->set_voltage &&
2228 !rdev->desc->ops->set_voltage_sel) {
414c70cb
LG		 2229 ret = -EINVAL;
2230 goto out;
2231 }
2232
2233 /* constraints check */
2234 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2235 if (ret < 0)
2236 goto out;
2237 regulator->min_uV = min_uV;
2238 regulator->max_uV = max_uV;
3a93f2a9 2239
05fda3b1
TP		 2240 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2241 if (ret < 0)
2242 goto out;
2243
75790251 2244 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
02fa3ec0 2245
414c70cb
LG		 2246out:
2247 mutex_unlock(&rdev->mutex);
2248 return ret;
2249}
2250EXPORT_SYMBOL_GPL(regulator_set_voltage);
2251
88cd222b
LW		 2252/**
2253 * regulator_set_voltage_time - get raise/fall time
2254 * @regulator: regulator source
2255 * @old_uV: starting voltage in microvolts
2256 * @new_uV: target voltage in microvolts
2257 *
2258 * Provided with the starting and ending voltage, this function attempts to
2259 * calculate the time in microseconds required to rise or fall to this new
2260 * voltage.
2261 */
2262int regulator_set_voltage_time(struct regulator *regulator,
2263 int old_uV, int new_uV)
2264{
2265 struct regulator_dev *rdev = regulator->rdev;
2266 struct regulator_ops *ops = rdev->desc->ops;
2267 int old_sel = -1;
2268 int new_sel = -1;
2269 int voltage;
2270 int i;
2271
2272 /* Currently requires operations to do this */
2273 if (!ops->list_voltage || !ops->set_voltage_time_sel
2274 || !rdev->desc->n_voltages)
2275 return -EINVAL;
2276
2277 for (i = 0; i < rdev->desc->n_voltages; i++) {
2278 /* We only look for exact voltage matches here */
2279 voltage = regulator_list_voltage(regulator, i);
2280 if (voltage < 0)
2281 return -EINVAL;
2282 if (voltage == 0)
2283 continue;
2284 if (voltage == old_uV)
2285 old_sel = i;
2286 if (voltage == new_uV)
2287 new_sel = i;
2288 }
2289
2290 if (old_sel < 0 || new_sel < 0)
2291 return -EINVAL;
2292
2293 return ops->set_voltage_time_sel(rdev, old_sel, new_sel);
2294}
2295EXPORT_SYMBOL_GPL(regulator_set_voltage_time);
2296
98a175b6
YSB		 2297/**
2298 *regulator_set_voltage_time_sel - get raise/fall time
2299 * @regulator: regulator source
2300 * @old_selector: selector for starting voltage
2301 * @new_selector: selector for target voltage
2302 *
2303 * Provided with the starting and target voltage selectors, this function
2304 * returns time in microseconds required to rise or fall to this new voltage
2305 *
f11d08c3 2306 * Drivers providing ramp_delay in regulation_constraints can use this as their
398715ab 2307 * set_voltage_time_sel() operation.
98a175b6
YSB		 2308 */
2309int regulator_set_voltage_time_sel(struct regulator_dev *rdev,
2310 unsigned int old_selector,
2311 unsigned int new_selector)
2312{
398715ab 2313 unsigned int ramp_delay = 0;
f11d08c3 2314 int old_volt, new_volt;
398715ab
AL		 2315
2316 if (rdev->constraints->ramp_delay)
2317 ramp_delay = rdev->constraints->ramp_delay;
2318 else if (rdev->desc->ramp_delay)
2319 ramp_delay = rdev->desc->ramp_delay;
2320
2321 if (ramp_delay == 0) {
6f0b2c69 2322 rdev_warn(rdev, "ramp_delay not set\n");
398715ab 2323 return 0;
6f0b2c69 2324 }
398715ab 2325
f11d08c3
AL		 2326 /* sanity check */
2327 if (!rdev->desc->ops->list_voltage)
2328 return -EINVAL;
398715ab 2329
f11d08c3
AL		 2330 old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
2331 new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);
2332
2333 return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
98a175b6 2334}
b19dbf71 2335EXPORT_SYMBOL_GPL(regulator_set_voltage_time_sel);
98a175b6 2336
606a2562
MB		 2337/**
2338 * regulator_sync_voltage - re-apply last regulator output voltage
2339 * @regulator: regulator source
2340 *
2341 * Re-apply the last configured voltage. This is intended to be used
2342 * where some external control source the consumer is cooperating with
2343 * has caused the configured voltage to change.
2344 */
2345int regulator_sync_voltage(struct regulator *regulator)
2346{
2347 struct regulator_dev *rdev = regulator->rdev;
2348 int ret, min_uV, max_uV;
2349
2350 mutex_lock(&rdev->mutex);
2351
2352 if (!rdev->desc->ops->set_voltage &&
2353 !rdev->desc->ops->set_voltage_sel) {
2354 ret = -EINVAL;
2355 goto out;
2356 }
2357
2358 /* This is only going to work if we've had a voltage configured. */
2359 if (!regulator->min_uV && !regulator->max_uV) {
2360 ret = -EINVAL;
2361 goto out;
2362 }
2363
2364 min_uV = regulator->min_uV;
2365 max_uV = regulator->max_uV;
2366
2367 /* This should be a paranoia check... */
2368 ret = regulator_check_voltage(rdev, &min_uV, &max_uV);
2369 if (ret < 0)
2370 goto out;
2371
2372 ret = regulator_check_consumers(rdev, &min_uV, &max_uV);
2373 if (ret < 0)
2374 goto out;
2375
2376 ret = _regulator_do_set_voltage(rdev, min_uV, max_uV);
2377
2378out:
2379 mutex_unlock(&rdev->mutex);
2380 return ret;
2381}
2382EXPORT_SYMBOL_GPL(regulator_sync_voltage);
2383
414c70cb
LG		 2384static int _regulator_get_voltage(struct regulator_dev *rdev)
2385{
bf5892a8 2386 int sel, ret;
476c2d83
MB		 2387
2388 if (rdev->desc->ops->get_voltage_sel) {
2389 sel = rdev->desc->ops->get_voltage_sel(rdev);
2390 if (sel < 0)
2391 return sel;
bf5892a8 2392 ret = rdev->desc->ops->list_voltage(rdev, sel);
cb220d16 2393 } else if (rdev->desc->ops->get_voltage) {
bf5892a8 2394 ret = rdev->desc->ops->get_voltage(rdev);
cb220d16 2395 } else {
414c70cb 2396 return -EINVAL;
cb220d16 2397 }
bf5892a8 2398
cb220d16
AL		 2399 if (ret < 0)
2400 return ret;
bf5892a8 2401 return ret - rdev->constraints->uV_offset;
414c70cb
LG		 2402}
2403
2404/**
2405 * regulator_get_voltage - get regulator output voltage
2406 * @regulator: regulator source
2407 *
2408 * This returns the current regulator voltage in uV.
2409 *
2410 * NOTE: If the regulator is disabled it will return the voltage value. This
2411 * function should not be used to determine regulator state.
2412 */
2413int regulator_get_voltage(struct regulator *regulator)
2414{
2415 int ret;
2416
2417 mutex_lock(&regulator->rdev->mutex);
2418
2419 ret = _regulator_get_voltage(regulator->rdev);
2420
2421 mutex_unlock(&regulator->rdev->mutex);
2422
2423 return ret;
2424}
2425EXPORT_SYMBOL_GPL(regulator_get_voltage);
2426
2427/**
2428 * regulator_set_current_limit - set regulator output current limit
2429 * @regulator: regulator source
2430 * @min_uA: Minimuum supported current in uA
2431 * @max_uA: Maximum supported current in uA
2432 *
2433 * Sets current sink to the desired output current. This can be set during
2434 * any regulator state. IOW, regulator can be disabled or enabled.
2435 *
2436 * If the regulator is enabled then the current will change to the new value
2437 * immediately otherwise if the regulator is disabled the regulator will
2438 * output at the new current when enabled.
2439 *
2440 * NOTE: Regulator system constraints must be set for this regulator before
2441 * calling this function otherwise this call will fail.
2442 */
2443int regulator_set_current_limit(struct regulator *regulator,
2444 int min_uA, int max_uA)
2445{
2446 struct regulator_dev *rdev = regulator->rdev;
2447 int ret;
2448
2449 mutex_lock(&rdev->mutex);
2450
2451 /* sanity check */
2452 if (!rdev->desc->ops->set_current_limit) {
2453 ret = -EINVAL;
2454 goto out;
2455 }
2456
2457 /* constraints check */
2458 ret = regulator_check_current_limit(rdev, &min_uA, &max_uA);
2459 if (ret < 0)
2460 goto out;
2461
2462 ret = rdev->desc->ops->set_current_limit(rdev, min_uA, max_uA);
2463out:
2464 mutex_unlock(&rdev->mutex);
2465 return ret;
2466}
2467EXPORT_SYMBOL_GPL(regulator_set_current_limit);
2468
2469static int _regulator_get_current_limit(struct regulator_dev *rdev)
2470{
2471 int ret;
2472
2473 mutex_lock(&rdev->mutex);
2474
2475 /* sanity check */
2476 if (!rdev->desc->ops->get_current_limit) {
2477 ret = -EINVAL;
2478 goto out;
2479 }
2480
2481 ret = rdev->desc->ops->get_current_limit(rdev);
2482out:
2483 mutex_unlock(&rdev->mutex);
2484 return ret;
2485}
2486
2487/**
2488 * regulator_get_current_limit - get regulator output current
2489 * @regulator: regulator source
2490 *
2491 * This returns the current supplied by the specified current sink in uA.
2492 *
2493 * NOTE: If the regulator is disabled it will return the current value. This
2494 * function should not be used to determine regulator state.
2495 */
2496int regulator_get_current_limit(struct regulator *regulator)
2497{
2498 return _regulator_get_current_limit(regulator->rdev);
2499}
2500EXPORT_SYMBOL_GPL(regulator_get_current_limit);
2501
2502/**
2503 * regulator_set_mode - set regulator operating mode
2504 * @regulator: regulator source
2505 * @mode: operating mode - one of the REGULATOR_MODE constants
2506 *
2507 * Set regulator operating mode to increase regulator efficiency or improve
2508 * regulation performance.
2509 *
2510 * NOTE: Regulator system constraints must be set for this regulator before
2511 * calling this function otherwise this call will fail.
2512 */
2513int regulator_set_mode(struct regulator *regulator, unsigned int mode)
2514{
2515 struct regulator_dev *rdev = regulator->rdev;
2516 int ret;
500b4ac9 2517 int regulator_curr_mode;
414c70cb
LG		 2518
2519 mutex_lock(&rdev->mutex);
2520
2521 /* sanity check */
2522 if (!rdev->desc->ops->set_mode) {
2523 ret = -EINVAL;
2524 goto out;
2525 }
2526
500b4ac9
SI		 2527 /* return if the same mode is requested */
2528 if (rdev->desc->ops->get_mode) {
2529 regulator_curr_mode = rdev->desc->ops->get_mode(rdev);
2530 if (regulator_curr_mode == mode) {
2531 ret = 0;
2532 goto out;
2533 }
2534 }
2535
414c70cb 2536 /* constraints check */
22c51b47 2537 ret = regulator_mode_constrain(rdev, &mode);
414c70cb
LG		 2538 if (ret < 0)
2539 goto out;
2540
2541 ret = rdev->desc->ops->set_mode(rdev, mode);
2542out:
2543 mutex_unlock(&rdev->mutex);
2544 return ret;
2545}
2546EXPORT_SYMBOL_GPL(regulator_set_mode);
2547
2548static unsigned int _regulator_get_mode(struct regulator_dev *rdev)
2549{
2550 int ret;
2551
2552 mutex_lock(&rdev->mutex);
2553
2554 /* sanity check */
2555 if (!rdev->desc->ops->get_mode) {
2556 ret = -EINVAL;
2557 goto out;
2558 }
2559
2560 ret = rdev->desc->ops->get_mode(rdev);
2561out:
2562 mutex_unlock(&rdev->mutex);
2563 return ret;
2564}
2565
2566/**
2567 * regulator_get_mode - get regulator operating mode
2568 * @regulator: regulator source
2569 *
2570 * Get the current regulator operating mode.
2571 */
2572unsigned int regulator_get_mode(struct regulator *regulator)
2573{
2574 return _regulator_get_mode(regulator->rdev);
2575}
2576EXPORT_SYMBOL_GPL(regulator_get_mode);
2577
2578/**
2579 * regulator_set_optimum_mode - set regulator optimum operating mode
2580 * @regulator: regulator source
2581 * @uA_load: load current
2582 *
2583 * Notifies the regulator core of a new device load. This is then used by
2584 * DRMS (if enabled by constraints) to set the most efficient regulator
2585 * operating mode for the new regulator loading.
2586 *
2587 * Consumer devices notify their supply regulator of the maximum power
2588 * they will require (can be taken from device datasheet in the power
2589 * consumption tables) when they change operational status and hence power
2590 * state. Examples of operational state changes that can affect power
2591 * consumption are :-
2592 *
2593 * o Device is opened / closed.
2594 * o Device I/O is about to begin or has just finished.
2595 * o Device is idling in between work.
2596 *
2597 * This information is also exported via sysfs to userspace.
2598 *
2599 * DRMS will sum the total requested load on the regulator and change
2600 * to the most efficient operating mode if platform constraints allow.
2601 *
2602 * Returns the new regulator mode or error.
2603 */
2604int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
2605{
2606 struct regulator_dev *rdev = regulator->rdev;
2607 struct regulator *consumer;
d92d95b6 2608 int ret, output_uV, input_uV = 0, total_uA_load = 0;
414c70cb
LG		 2609 unsigned int mode;
2610
d92d95b6
SB		 2611 if (rdev->supply)
2612 input_uV = regulator_get_voltage(rdev->supply);
2613
414c70cb
LG		 2614 mutex_lock(&rdev->mutex);
2615
a4b41483
MB		 2616 /*
2617 * first check to see if we can set modes at all, otherwise just
2618 * tell the consumer everything is OK.
2619 */
414c70cb
LG		 2620 regulator->uA_load = uA_load;
2621 ret = regulator_check_drms(rdev);
a4b41483
MB		 2622 if (ret < 0) {
2623 ret = 0;
414c70cb 2624 goto out;
a4b41483 2625 }
414c70cb 2626
414c70cb
LG		 2627 if (!rdev->desc->ops->get_optimum_mode)
2628 goto out;
2629
a4b41483
MB		 2630 /*
2631 * we can actually do this so any errors are indicators of
2632 * potential real failure.
2633 */
2634 ret = -EINVAL;
2635
854ccbae
AL		 2636 if (!rdev->desc->ops->set_mode)
2637 goto out;
2638
414c70cb 2639 /* get output voltage */
1bf5a1f8 2640 output_uV = _regulator_get_voltage(rdev);
414c70cb 2641 if (output_uV <= 0) {
5da84fd9 2642 rdev_err(rdev, "invalid output voltage found\n");
414c70cb
LG		 2643 goto out;
2644 }
2645
d92d95b6 2646 /* No supply? Use constraint voltage */
1bf5a1f8 2647 if (input_uV <= 0)
414c70cb
LG		 2648 input_uV = rdev->constraints->input_uV;
2649 if (input_uV <= 0) {
5da84fd9 2650 rdev_err(rdev, "invalid input voltage found\n");
414c70cb
LG		 2651 goto out;
2652 }
2653
2654 /* calc total requested load for this regulator */
2655 list_for_each_entry(consumer, &rdev->consumer_list, list)
fa2984d4 2656 total_uA_load += consumer->uA_load;
414c70cb
LG		 2657
2658 mode = rdev->desc->ops->get_optimum_mode(rdev,
2659 input_uV, output_uV,
2660 total_uA_load);
2c608234 2661 ret = regulator_mode_constrain(rdev, &mode);
e573520b 2662 if (ret < 0) {
5da84fd9
JP		 2663 rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
2664 total_uA_load, input_uV, output_uV);
414c70cb
LG		 2665 goto out;
2666 }
2667
2668 ret = rdev->desc->ops->set_mode(rdev, mode);
e573520b 2669 if (ret < 0) {
5da84fd9 2670 rdev_err(rdev, "failed to set optimum mode %x\n", mode);
414c70cb
LG		 2671 goto out;
2672 }
2673 ret = mode;
2674out:
2675 mutex_unlock(&rdev->mutex);
2676 return ret;
2677}
2678EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
2679
2680/**
2681 * regulator_register_notifier - register regulator event notifier
2682 * @regulator: regulator source
69279fb9 2683 * @nb: notifier block
414c70cb
LG		 2684 *
2685 * Register notifier block to receive regulator events.
2686 */
2687int regulator_register_notifier(struct regulator *regulator,
2688 struct notifier_block *nb)
2689{
2690 return blocking_notifier_chain_register(&regulator->rdev->notifier,
2691 nb);
2692}
2693EXPORT_SYMBOL_GPL(regulator_register_notifier);
2694
2695/**
2696 * regulator_unregister_notifier - unregister regulator event notifier
2697 * @regulator: regulator source
69279fb9 2698 * @nb: notifier block
414c70cb
LG		 2699 *
2700 * Unregister regulator event notifier block.
2701 */
2702int regulator_unregister_notifier(struct regulator *regulator,
2703 struct notifier_block *nb)
2704{
2705 return blocking_notifier_chain_unregister(&regulator->rdev->notifier,
2706 nb);
2707}
2708EXPORT_SYMBOL_GPL(regulator_unregister_notifier);
2709
b136fb44
JC		 2710/* notify regulator consumers and downstream regulator consumers.
2711 * Note mutex must be held by caller.
2712 */
414c70cb
LG		 2713static void _notifier_call_chain(struct regulator_dev *rdev,
2714 unsigned long event, void *data)
2715{
414c70cb 2716 /* call rdev chain first */
d8493d21 2717 blocking_notifier_call_chain(&rdev->notifier, event, data);
414c70cb
LG		 2718}
2719
2720/**
2721 * regulator_bulk_get - get multiple regulator consumers
2722 *
2723 * @dev: Device to supply
2724 * @num_consumers: Number of consumers to register
2725 * @consumers: Configuration of consumers; clients are stored here.
2726 *
2727 * @return 0 on success, an errno on failure.
2728 *
2729 * This helper function allows drivers to get several regulator
2730 * consumers in one operation. If any of the regulators cannot be
2731 * acquired then any regulators that were allocated will be freed
2732 * before returning to the caller.
2733 */
2734int regulator_bulk_get(struct device *dev, int num_consumers,
2735 struct regulator_bulk_data *consumers)
2736{
2737 int i;
2738 int ret;
2739
2740 for (i = 0; i < num_consumers; i++)
2741 consumers[i].consumer = NULL;
2742
2743 for (i = 0; i < num_consumers; i++) {
2744 consumers[i].consumer = regulator_get(dev,
2745 consumers[i].supply);
2746 if (IS_ERR(consumers[i].consumer)) {
414c70cb 2747 ret = PTR_ERR(consumers[i].consumer);
5b307627
MB		 2748 dev_err(dev, "Failed to get supply '%s': %d\n",
2749 consumers[i].supply, ret);
414c70cb
LG		 2750 consumers[i].consumer = NULL;
2751 goto err;
2752 }
2753 }
2754
2755 return 0;
2756
2757err:
b29c7690 2758 while (--i >= 0)
414c70cb
LG		 2759 regulator_put(consumers[i].consumer);
2760
2761 return ret;
2762}
2763EXPORT_SYMBOL_GPL(regulator_bulk_get);
2764
e6e74030
MB		 2765/**
2766 * devm_regulator_bulk_get - managed get multiple regulator consumers
2767 *
2768 * @dev: Device to supply
2769 * @num_consumers: Number of consumers to register
2770 * @consumers: Configuration of consumers; clients are stored here.
2771 *
2772 * @return 0 on success, an errno on failure.
2773 *
2774 * This helper function allows drivers to get several regulator
2775 * consumers in one operation with management, the regulators will
2776 * automatically be freed when the device is unbound. If any of the
2777 * regulators cannot be acquired then any regulators that were
2778 * allocated will be freed before returning to the caller.
2779 */
2780int devm_regulator_bulk_get(struct device *dev, int num_consumers,
2781 struct regulator_bulk_data *consumers)
2782{
2783 int i;
2784 int ret;
2785
2786 for (i = 0; i < num_consumers; i++)
2787 consumers[i].consumer = NULL;
2788
2789 for (i = 0; i < num_consumers; i++) {
2790 consumers[i].consumer = devm_regulator_get(dev,
2791 consumers[i].supply);
2792 if (IS_ERR(consumers[i].consumer)) {
2793 ret = PTR_ERR(consumers[i].consumer);
2794 dev_err(dev, "Failed to get supply '%s': %d\n",
2795 consumers[i].supply, ret);
2796 consumers[i].consumer = NULL;
2797 goto err;
2798 }
2799 }
2800
2801 return 0;
2802
2803err:
2804 for (i = 0; i < num_consumers && consumers[i].consumer; i++)
2805 devm_regulator_put(consumers[i].consumer);
2806
2807 return ret;
2808}
2809EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
2810
f21e0e81
MB		 2811static void regulator_bulk_enable_async(void *data, async_cookie_t cookie)
2812{
2813 struct regulator_bulk_data *bulk = data;
2814
2815 bulk->ret = regulator_enable(bulk->consumer);
2816}
2817
414c70cb
LG		 2818/**
2819 * regulator_bulk_enable - enable multiple regulator consumers
2820 *
2821 * @num_consumers: Number of consumers
2822 * @consumers: Consumer data; clients are stored here.
2823 * @return 0 on success, an errno on failure
2824 *
2825 * This convenience API allows consumers to enable multiple regulator
2826 * clients in a single API call. If any consumers cannot be enabled
2827 * then any others that were enabled will be disabled again prior to
2828 * return.
2829 */
2830int regulator_bulk_enable(int num_consumers,
2831 struct regulator_bulk_data *consumers)
2832{
2955b47d 2833 ASYNC_DOMAIN_EXCLUSIVE(async_domain);
414c70cb 2834 int i;
f21e0e81 2835 int ret = 0;
414c70cb 2836
6492bc1b
MB		 2837 for (i = 0; i < num_consumers; i++) {
2838 if (consumers[i].consumer->always_on)
2839 consumers[i].ret = 0;
2840 else
2841 async_schedule_domain(regulator_bulk_enable_async,
2842 &consumers[i], &async_domain);
2843 }
f21e0e81
MB		 2844
2845 async_synchronize_full_domain(&async_domain);
2846
2847 /* If any consumer failed we need to unwind any that succeeded */
414c70cb 2848 for (i = 0; i < num_consumers; i++) {
f21e0e81
MB		 2849 if (consumers[i].ret != 0) {
2850 ret = consumers[i].ret;
414c70cb 2851 goto err;
f21e0e81 2852 }
414c70cb
LG		 2853 }
2854
2855 return 0;
2856
2857err:
b29c7690
AL		 2858 pr_err("Failed to enable %s: %d\n", consumers[i].supply, ret);
2859 while (--i >= 0)
2860 regulator_disable(consumers[i].consumer);
414c70cb
LG		 2861
2862 return ret;
2863}
2864EXPORT_SYMBOL_GPL(regulator_bulk_enable);
2865
2866/**
2867 * regulator_bulk_disable - disable multiple regulator consumers
2868 *
2869 * @num_consumers: Number of consumers
2870 * @consumers: Consumer data; clients are stored here.
2871 * @return 0 on success, an errno on failure
2872 *
2873 * This convenience API allows consumers to disable multiple regulator
49e22632
SN		 2874 * clients in a single API call. If any consumers cannot be disabled
2875 * then any others that were disabled will be enabled again prior to
414c70cb
LG		 2876 * return.
2877 */
2878int regulator_bulk_disable(int num_consumers,
2879 struct regulator_bulk_data *consumers)
2880{
2881 int i;
01e86f49 2882 int ret, r;
414c70cb 2883
49e22632 2884 for (i = num_consumers - 1; i >= 0; --i) {
414c70cb
LG		 2885 ret = regulator_disable(consumers[i].consumer);
2886 if (ret != 0)
2887 goto err;
2888 }
2889
2890 return 0;
2891
2892err:
5da84fd9 2893 pr_err("Failed to disable %s: %d\n", consumers[i].supply, ret);
01e86f49
MB		 2894 for (++i; i < num_consumers; ++i) {
2895 r = regulator_enable(consumers[i].consumer);
2896 if (r != 0)
2897 pr_err("Failed to reename %s: %d\n",
2898 consumers[i].supply, r);
2899 }
414c70cb
LG		 2900
2901 return ret;
2902}
2903EXPORT_SYMBOL_GPL(regulator_bulk_disable);
2904
e1de2f42
DK		 2905/**
2906 * regulator_bulk_force_disable - force disable multiple regulator consumers
2907 *
2908 * @num_consumers: Number of consumers
2909 * @consumers: Consumer data; clients are stored here.
2910 * @return 0 on success, an errno on failure
2911 *
2912 * This convenience API allows consumers to forcibly disable multiple regulator
2913 * clients in a single API call.
2914 * NOTE: This should be used for situations when device damage will
2915 * likely occur if the regulators are not disabled (e.g. over temp).
2916 * Although regulator_force_disable function call for some consumers can
2917 * return error numbers, the function is called for all consumers.
2918 */
2919int regulator_bulk_force_disable(int num_consumers,
2920 struct regulator_bulk_data *consumers)
2921{
2922 int i;
2923 int ret;
2924
2925 for (i = 0; i < num_consumers; i++)
2926 consumers[i].ret =
2927 regulator_force_disable(consumers[i].consumer);
2928
2929 for (i = 0; i < num_consumers; i++) {
2930 if (consumers[i].ret != 0) {
2931 ret = consumers[i].ret;
2932 goto out;
2933 }
2934 }
2935
2936 return 0;
2937out:
2938 return ret;
2939}
2940EXPORT_SYMBOL_GPL(regulator_bulk_force_disable);
2941
414c70cb
LG		 2942/**
2943 * regulator_bulk_free - free multiple regulator consumers
2944 *
2945 * @num_consumers: Number of consumers
2946 * @consumers: Consumer data; clients are stored here.
2947 *
2948 * This convenience API allows consumers to free multiple regulator
2949 * clients in a single API call.
2950 */
2951void regulator_bulk_free(int num_consumers,
2952 struct regulator_bulk_data *consumers)
2953{
2954 int i;
2955
2956 for (i = 0; i < num_consumers; i++) {
2957 regulator_put(consumers[i].consumer);
2958 consumers[i].consumer = NULL;
2959 }
2960}
2961EXPORT_SYMBOL_GPL(regulator_bulk_free);
2962
2963/**
2964 * regulator_notifier_call_chain - call regulator event notifier
69279fb9 2965 * @rdev: regulator source
414c70cb 2966 * @event: notifier block
69279fb9 2967 * @data: callback-specific data.
414c70cb
LG		 2968 *
2969 * Called by regulator drivers to notify clients a regulator event has
2970 * occurred. We also notify regulator clients downstream.
b136fb44 2971 * Note lock must be held by caller.
414c70cb
LG		 2972 */
2973int regulator_notifier_call_chain(struct regulator_dev *rdev,
2974 unsigned long event, void *data)
2975{
2976 _notifier_call_chain(rdev, event, data);
2977 return NOTIFY_DONE;
2978
2979}
2980EXPORT_SYMBOL_GPL(regulator_notifier_call_chain);
2981
be721979
MB		 2982/**
2983 * regulator_mode_to_status - convert a regulator mode into a status
2984 *
2985 * @mode: Mode to convert
2986 *
2987 * Convert a regulator mode into a status.
2988 */
2989int regulator_mode_to_status(unsigned int mode)
2990{
2991 switch (mode) {
2992 case REGULATOR_MODE_FAST:
2993 return REGULATOR_STATUS_FAST;
2994 case REGULATOR_MODE_NORMAL:
2995 return REGULATOR_STATUS_NORMAL;
2996 case REGULATOR_MODE_IDLE:
2997 return REGULATOR_STATUS_IDLE;
03ffcf3d 2998 case REGULATOR_MODE_STANDBY:
be721979
MB		 2999 return REGULATOR_STATUS_STANDBY;
3000 default:
1beaf762 3001 return REGULATOR_STATUS_UNDEFINED;
be721979
MB		 3002 }
3003}
3004EXPORT_SYMBOL_GPL(regulator_mode_to_status);
3005
7ad68e2f
DB		 3006/*
3007 * To avoid cluttering sysfs (and memory) with useless state, only
3008 * create attributes that can be meaningfully displayed.
3009 */
3010static int add_regulator_attributes(struct regulator_dev *rdev)
3011{
3012 struct device *dev = &rdev->dev;
3013 struct regulator_ops *ops = rdev->desc->ops;
3014 int status = 0;
3015
3016 /* some attributes need specific methods to be displayed */
4c78899b
MB		 3017 if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) ||
3018 (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) {
7ad68e2f
DB		 3019 status = device_create_file(dev, &dev_attr_microvolts);
3020 if (status < 0)
3021 return status;
3022 }
3023 if (ops->get_current_limit) {
3024 status = device_create_file(dev, &dev_attr_microamps);
3025 if (status < 0)
3026 return status;
3027 }
3028 if (ops->get_mode) {
3029 status = device_create_file(dev, &dev_attr_opmode);
3030 if (status < 0)
3031 return status;
3032 }
3033 if (ops->is_enabled) {
3034 status = device_create_file(dev, &dev_attr_state);
3035 if (status < 0)
3036 return status;
3037 }
853116a1
DB		 3038 if (ops->get_status) {
3039 status = device_create_file(dev, &dev_attr_status);
3040 if (status < 0)
3041 return status;
3042 }
7ad68e2f
DB		 3043
3044 /* some attributes are type-specific */
3045 if (rdev->desc->type == REGULATOR_CURRENT) {
3046 status = device_create_file(dev, &dev_attr_requested_microamps);
3047 if (status < 0)
3048 return status;
3049 }
3050
3051 /* all the other attributes exist to support constraints;
3052 * don't show them if there are no constraints, or if the
3053 * relevant supporting methods are missing.
3054 */
3055 if (!rdev->constraints)
3056 return status;
3057
3058 /* constraints need specific supporting methods */
e8eef82b 3059 if (ops->set_voltage || ops->set_voltage_sel) {
7ad68e2f
DB		 3060 status = device_create_file(dev, &dev_attr_min_microvolts);
3061 if (status < 0)
3062 return status;
3063 status = device_create_file(dev, &dev_attr_max_microvolts);
3064 if (status < 0)
3065 return status;
3066 }
3067 if (ops->set_current_limit) {
3068 status = device_create_file(dev, &dev_attr_min_microamps);
3069 if (status < 0)
3070 return status;
3071 status = device_create_file(dev, &dev_attr_max_microamps);
3072 if (status < 0)
3073 return status;
3074 }
3075
7ad68e2f
DB		 3076 status = device_create_file(dev, &dev_attr_suspend_standby_state);
3077 if (status < 0)
3078 return status;
3079 status = device_create_file(dev, &dev_attr_suspend_mem_state);
3080 if (status < 0)
3081 return status;
3082 status = device_create_file(dev, &dev_attr_suspend_disk_state);
3083 if (status < 0)
3084 return status;
3085
3086 if (ops->set_suspend_voltage) {
3087 status = device_create_file(dev,
3088 &dev_attr_suspend_standby_microvolts);
3089 if (status < 0)
3090 return status;
3091 status = device_create_file(dev,
3092 &dev_attr_suspend_mem_microvolts);
3093 if (status < 0)
3094 return status;
3095 status = device_create_file(dev,
3096 &dev_attr_suspend_disk_microvolts);
3097 if (status < 0)
3098 return status;
3099 }
3100
3101 if (ops->set_suspend_mode) {
3102 status = device_create_file(dev,
3103 &dev_attr_suspend_standby_mode);
3104 if (status < 0)
3105 return status;
3106 status = device_create_file(dev,
3107 &dev_attr_suspend_mem_mode);
3108 if (status < 0)
3109 return status;
3110 status = device_create_file(dev,
3111 &dev_attr_suspend_disk_mode);
3112 if (status < 0)
3113 return status;
3114 }
3115
3116 return status;
3117}
3118
1130e5b3
MB		 3119static void rdev_init_debugfs(struct regulator_dev *rdev)
3120{
1130e5b3 3121 rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
24751434 3122 if (!rdev->debugfs) {
1130e5b3 3123 rdev_warn(rdev, "Failed to create debugfs directory\n");
1130e5b3
MB		 3124 return;
3125 }
3126
3127 debugfs_create_u32("use_count", 0444, rdev->debugfs,
3128 &rdev->use_count);
3129 debugfs_create_u32("open_count", 0444, rdev->debugfs,
3130 &rdev->open_count);
1130e5b3
MB		 3131}
3132
414c70cb
LG		 3133/**
3134 * regulator_register - register regulator
69279fb9 3135 * @regulator_desc: regulator to register
c172708d 3136 * @config: runtime configuration for regulator
414c70cb
LG		 3137 *
3138 * Called by regulator drivers to register a regulator.
3139 * Returns 0 on success.
3140 */
65f26846
MB		 3141struct regulator_dev *
3142regulator_register(const struct regulator_desc *regulator_desc,
c172708d 3143 const struct regulator_config *config)
414c70cb 3144{
9a8f5e07 3145 const struct regulation_constraints *constraints = NULL;
c172708d 3146 const struct regulator_init_data *init_data;
414c70cb
LG		 3147 static atomic_t regulator_no = ATOMIC_INIT(0);
3148 struct regulator_dev *rdev;
32c8fad4 3149 struct device *dev;
a5766f11 3150 int ret, i;
69511a45 3151 const char *supply = NULL;
414c70cb 3152
c172708d 3153 if (regulator_desc == NULL || config == NULL)
414c70cb
LG		 3154 return ERR_PTR(-EINVAL);
3155
32c8fad4 3156 dev = config->dev;
dcf70112 3157 WARN_ON(!dev);
32c8fad4 3158
414c70cb
LG		 3159 if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
3160 return ERR_PTR(-EINVAL);
3161
cd78dfc6
DL		 3162 if (regulator_desc->type != REGULATOR_VOLTAGE &&
3163 regulator_desc->type != REGULATOR_CURRENT)
414c70cb
LG		 3164 return ERR_PTR(-EINVAL);
3165
476c2d83
MB		 3166 /* Only one of each should be implemented */
3167 WARN_ON(regulator_desc->ops->get_voltage &&
3168 regulator_desc->ops->get_voltage_sel);
e8eef82b
MB		 3169 WARN_ON(regulator_desc->ops->set_voltage &&
3170 regulator_desc->ops->set_voltage_sel);
476c2d83
MB		 3171
3172 /* If we're using selectors we must implement list_voltage. */
3173 if (regulator_desc->ops->get_voltage_sel &&
3174 !regulator_desc->ops->list_voltage) {
3175 return ERR_PTR(-EINVAL);
3176 }
e8eef82b
MB		 3177 if (regulator_desc->ops->set_voltage_sel &&
3178 !regulator_desc->ops->list_voltage) {
3179 return ERR_PTR(-EINVAL);
3180 }
476c2d83 3181
c172708d
MB		 3182 init_data = config->init_data;
3183
414c70cb
LG		 3184 rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL);
3185 if (rdev == NULL)
3186 return ERR_PTR(-ENOMEM);
3187
3188 mutex_lock(&regulator_list_mutex);
3189
3190 mutex_init(&rdev->mutex);
c172708d 3191 rdev->reg_data = config->driver_data;
414c70cb
LG		 3192 rdev->owner = regulator_desc->owner;
3193 rdev->desc = regulator_desc;
3a4b0a07
MB		 3194 if (config->regmap)
3195 rdev->regmap = config->regmap;
3196 else
3197 rdev->regmap = dev_get_regmap(dev, NULL);
414c70cb 3198 INIT_LIST_HEAD(&rdev->consumer_list);
414c70cb 3199 INIT_LIST_HEAD(&rdev->list);
414c70cb 3200 BLOCKING_INIT_NOTIFIER_HEAD(&rdev->notifier);
da07ecd9 3201 INIT_DELAYED_WORK(&rdev->disable_work, regulator_disable_work);
414c70cb 3202
a5766f11 3203 /* preform any regulator specific init */
9a8f5e07 3204 if (init_data && init_data->regulator_init) {
a5766f11 3205 ret = init_data->regulator_init(rdev->reg_data);
4fca9545
DB		 3206 if (ret < 0)
3207 goto clean;
a5766f11
LG		 3208 }
3209
a5766f11 3210 /* register with sysfs */
414c70cb 3211 rdev->dev.class = &regulator_class;
c172708d 3212 rdev->dev.of_node = config->of_node;
a5766f11 3213 rdev->dev.parent = dev;
812460a9
KS		 3214 dev_set_name(&rdev->dev, "regulator.%d",
3215 atomic_inc_return(&regulator_no) - 1);
a5766f11 3216 ret = device_register(&rdev->dev);
ad7725cb
VK		 3217 if (ret != 0) {
3218 put_device(&rdev->dev);
4fca9545 3219 goto clean;
ad7725cb 3220 }
a5766f11
LG		 3221
3222 dev_set_drvdata(&rdev->dev, rdev);
3223
65f73508
MB		 3224 if (config->ena_gpio) {
3225 ret = gpio_request_one(config->ena_gpio,
3226 GPIOF_DIR_OUT | config->ena_gpio_flags,
3227 rdev_get_name(rdev));
3228 if (ret != 0) {
3229 rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
3230 config->ena_gpio, ret);
3231 goto clean;
3232 }
3233
3234 rdev->ena_gpio = config->ena_gpio;
3235 rdev->ena_gpio_invert = config->ena_gpio_invert;
3236
3237 if (config->ena_gpio_flags & GPIOF_OUT_INIT_HIGH)
3238 rdev->ena_gpio_state = 1;
3239
3240 if (rdev->ena_gpio_invert)
3241 rdev->ena_gpio_state = !rdev->ena_gpio_state;
3242 }
3243
74f544c1 3244 /* set regulator constraints */
9a8f5e07
MB		 3245 if (init_data)
3246 constraints = &init_data->constraints;
3247
3248 ret = set_machine_constraints(rdev, constraints);
74f544c1
MR		 3249 if (ret < 0)
3250 goto scrub;
3251
7ad68e2f
DB		 3252 /* add attributes supported by this regulator */
3253 ret = add_regulator_attributes(rdev);
3254 if (ret < 0)
3255 goto scrub;
3256
9a8f5e07 3257 if (init_data && init_data->supply_regulator)
69511a45
RN		 3258 supply = init_data->supply_regulator;
3259 else if (regulator_desc->supply_name)
3260 supply = regulator_desc->supply_name;
3261
3262 if (supply) {
0178f3e2 3263 struct regulator_dev *r;
0178f3e2 3264
6d191a5f 3265 r = regulator_dev_lookup(dev, supply, &ret);
0178f3e2 3266
69511a45
RN		 3267 if (!r) {
3268 dev_err(dev, "Failed to find supply %s\n", supply);
04bf3011 3269 ret = -EPROBE_DEFER;
0178f3e2
MB		 3270 goto scrub;
3271 }
3272
3273 ret = set_supply(rdev, r);
3274 if (ret < 0)
3275 goto scrub;
b2296bd4
LD		 3276
3277 /* Enable supply if rail is enabled */
b1a86831 3278 if (_regulator_is_enabled(rdev)) {
b2296bd4
LD		 3279 ret = regulator_enable(rdev->supply);
3280 if (ret < 0)
3281 goto scrub;
3282 }
0178f3e2
MB		 3283 }
3284
a5766f11 3285 /* add consumers devices */
9a8f5e07
MB		 3286 if (init_data) {
3287 for (i = 0; i < init_data->num_consumer_supplies; i++) {
3288 ret = set_consumer_device_supply(rdev,
9a8f5e07 3289 init_data->consumer_supplies[i].dev_name,
23c2f041 3290 init_data->consumer_supplies[i].supply);
9a8f5e07
MB		 3291 if (ret < 0) {
3292 dev_err(dev, "Failed to set supply %s\n",
3293 init_data->consumer_supplies[i].supply);
3294 goto unset_supplies;
3295 }
23c2f041 3296 }
414c70cb 3297 }
a5766f11
LG		 3298
3299 list_add(&rdev->list, &regulator_list);
1130e5b3
MB		 3300
3301 rdev_init_debugfs(rdev);
a5766f11 3302out:
414c70cb
LG		 3303 mutex_unlock(&regulator_list_mutex);
3304 return rdev;
4fca9545 3305
d4033b54
JN		 3306unset_supplies:
3307 unset_regulator_supplies(rdev);
3308
4fca9545 3309scrub:
e81dba85
MB		 3310 if (rdev->supply)
3311 regulator_put(rdev->supply);
65f73508
MB		 3312 if (rdev->ena_gpio)
3313 gpio_free(rdev->ena_gpio);
1a6958e7 3314 kfree(rdev->constraints);
4fca9545 3315 device_unregister(&rdev->dev);
53032daf
PW		 3316 /* device core frees rdev */
3317 rdev = ERR_PTR(ret);
3318 goto out;
3319
4fca9545
DB		 3320clean:
3321 kfree(rdev);
3322 rdev = ERR_PTR(ret);
3323 goto out;
414c70cb
LG		 3324}
3325EXPORT_SYMBOL_GPL(regulator_register);
3326
3327/**
3328 * regulator_unregister - unregister regulator
69279fb9 3329 * @rdev: regulator to unregister
414c70cb
LG		 3330 *
3331 * Called by regulator drivers to unregister a regulator.
3332 */
3333void regulator_unregister(struct regulator_dev *rdev)
3334{
3335 if (rdev == NULL)
3336 return;
3337
e032b376
MB		 3338 if (rdev->supply)
3339 regulator_put(rdev->supply);
414c70cb 3340 mutex_lock(&regulator_list_mutex);
1130e5b3 3341 debugfs_remove_recursive(rdev->debugfs);
da07ecd9 3342 flush_work_sync(&rdev->disable_work.work);
6bf87d17 3343 WARN_ON(rdev->open_count);
0f1d747b 3344 unset_regulator_supplies(rdev);
414c70cb 3345 list_del(&rdev->list);
f8c12fe3 3346 kfree(rdev->constraints);
65f73508
MB		 3347 if (rdev->ena_gpio)
3348 gpio_free(rdev->ena_gpio);
58fb5cf5 3349 device_unregister(&rdev->dev);
414c70cb
LG		 3350 mutex_unlock(&regulator_list_mutex);
3351}
3352EXPORT_SYMBOL_GPL(regulator_unregister);
3353
414c70cb 3354/**
cf7bbcdf 3355 * regulator_suspend_prepare - prepare regulators for system wide suspend
414c70cb
LG		 3356 * @state: system suspend state
3357 *
3358 * Configure each regulator with it's suspend operating parameters for state.
3359 * This will usually be called by machine suspend code prior to supending.
3360 */
3361int regulator_suspend_prepare(suspend_state_t state)
3362{
3363 struct regulator_dev *rdev;
3364 int ret = 0;
3365
3366 /* ON is handled by regulator active state */
3367 if (state == PM_SUSPEND_ON)
3368 return -EINVAL;
3369
3370 mutex_lock(&regulator_list_mutex);
3371 list_for_each_entry(rdev, &regulator_list, list) {
3372
3373 mutex_lock(&rdev->mutex);
3374 ret = suspend_prepare(rdev, state);
3375 mutex_unlock(&rdev->mutex);
3376
3377 if (ret < 0) {
5da84fd9 3378 rdev_err(rdev, "failed to prepare\n");
414c70cb
LG		 3379 goto out;
3380 }
3381 }
3382out:
3383 mutex_unlock(&regulator_list_mutex);
3384 return ret;
3385}
3386EXPORT_SYMBOL_GPL(regulator_suspend_prepare);
3387
7a32b589
MH		 3388/**
3389 * regulator_suspend_finish - resume regulators from system wide suspend
3390 *
3391 * Turn on regulators that might be turned off by regulator_suspend_prepare
3392 * and that should be turned on according to the regulators properties.
3393 */
3394int regulator_suspend_finish(void)
3395{
3396 struct regulator_dev *rdev;
3397 int ret = 0, error;
3398
3399 mutex_lock(&regulator_list_mutex);
3400 list_for_each_entry(rdev, &regulator_list, list) {
3401 struct regulator_ops *ops = rdev->desc->ops;
3402
3403 mutex_lock(&rdev->mutex);
3404 if ((rdev->use_count > 0 || rdev->constraints->always_on) &&
3405 ops->enable) {
3406 error = ops->enable(rdev);
3407 if (error)
3408 ret = error;
3409 } else {
3410 if (!has_full_constraints)
3411 goto unlock;
3412 if (!ops->disable)
3413 goto unlock;
b1a86831 3414 if (!_regulator_is_enabled(rdev))
7a32b589
MH		 3415 goto unlock;
3416
3417 error = ops->disable(rdev);
3418 if (error)
3419 ret = error;
3420 }
3421unlock:
3422 mutex_unlock(&rdev->mutex);
3423 }
3424 mutex_unlock(&regulator_list_mutex);
3425 return ret;
3426}
3427EXPORT_SYMBOL_GPL(regulator_suspend_finish);
3428
ca725561
MB		 3429/**
3430 * regulator_has_full_constraints - the system has fully specified constraints
3431 *
3432 * Calling this function will cause the regulator API to disable all
3433 * regulators which have a zero use count and don't have an always_on
3434 * constraint in a late_initcall.
3435 *
3436 * The intention is that this will become the default behaviour in a
3437 * future kernel release so users are encouraged to use this facility
3438 * now.
3439 */
3440void regulator_has_full_constraints(void)
3441{
3442 has_full_constraints = 1;
3443}
3444EXPORT_SYMBOL_GPL(regulator_has_full_constraints);
3445
688fe99a
MB		 3446/**
3447 * regulator_use_dummy_regulator - Provide a dummy regulator when none is found
3448 *
3449 * Calling this function will cause the regulator API to provide a
3450 * dummy regulator to consumers if no physical regulator is found,
3451 * allowing most consumers to proceed as though a regulator were
3452 * configured. This allows systems such as those with software
3453 * controllable regulators for the CPU core only to be brought up more
3454 * readily.
3455 */
3456void regulator_use_dummy_regulator(void)
3457{
3458 board_wants_dummy_regulator = true;
3459}
3460EXPORT_SYMBOL_GPL(regulator_use_dummy_regulator);
3461
414c70cb
LG		 3462/**
3463 * rdev_get_drvdata - get rdev regulator driver data
69279fb9 3464 * @rdev: regulator
414c70cb
LG		 3465 *
3466 * Get rdev regulator driver private data. This call can be used in the
3467 * regulator driver context.
3468 */
3469void *rdev_get_drvdata(struct regulator_dev *rdev)
3470{
3471 return rdev->reg_data;
3472}
3473EXPORT_SYMBOL_GPL(rdev_get_drvdata);
3474
3475/**
3476 * regulator_get_drvdata - get regulator driver data
3477 * @regulator: regulator
3478 *
3479 * Get regulator driver private data. This call can be used in the consumer
3480 * driver context when non API regulator specific functions need to be called.
3481 */
3482void *regulator_get_drvdata(struct regulator *regulator)
3483{
3484 return regulator->rdev->reg_data;
3485}
3486EXPORT_SYMBOL_GPL(regulator_get_drvdata);
3487
3488/**
3489 * regulator_set_drvdata - set regulator driver data
3490 * @regulator: regulator
3491 * @data: data
3492 */
3493void regulator_set_drvdata(struct regulator *regulator, void *data)
3494{
3495 regulator->rdev->reg_data = data;
3496}
3497EXPORT_SYMBOL_GPL(regulator_set_drvdata);
3498
3499/**
3500 * regulator_get_id - get regulator ID
69279fb9 3501 * @rdev: regulator
414c70cb
LG		 3502 */
3503int rdev_get_id(struct regulator_dev *rdev)
3504{
3505 return rdev->desc->id;
3506}
3507EXPORT_SYMBOL_GPL(rdev_get_id);
3508
a5766f11
LG		 3509struct device *rdev_get_dev(struct regulator_dev *rdev)
3510{
3511 return &rdev->dev;
3512}
3513EXPORT_SYMBOL_GPL(rdev_get_dev);
3514
3515void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
3516{
3517 return reg_init_data->driver_data;
3518}
3519EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
3520
ba55a974
MB		 3521#ifdef CONFIG_DEBUG_FS
3522static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
3523 size_t count, loff_t *ppos)
3524{
3525 char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
3526 ssize_t len, ret = 0;
3527 struct regulator_map *map;
3528
3529 if (!buf)
3530 return -ENOMEM;
3531
3532 list_for_each_entry(map, &regulator_map_list, list) {
3533 len = snprintf(buf + ret, PAGE_SIZE - ret,
3534 "%s -> %s.%s\n",
3535 rdev_get_name(map->regulator), map->dev_name,
3536 map->supply);
3537 if (len >= 0)
3538 ret += len;
3539 if (ret > PAGE_SIZE) {
3540 ret = PAGE_SIZE;
3541 break;
3542 }
3543 }
3544
3545 ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
3546
3547 kfree(buf);
3548
3549 return ret;
3550}
24751434 3551#endif
ba55a974
MB		 3552
3553static const struct file_operations supply_map_fops = {
24751434 3554#ifdef CONFIG_DEBUG_FS
ba55a974
MB		 3555 .read = supply_map_read_file,
3556 .llseek = default_llseek,
ba55a974 3557#endif
24751434 3558};
ba55a974 3559
414c70cb
LG		 3560static int __init regulator_init(void)
3561{
34abbd68
MB		 3562 int ret;
3563
34abbd68
MB		 3564 ret = class_register(&regulator_class);
3565
1130e5b3 3566 debugfs_root = debugfs_create_dir("regulator", NULL);
24751434 3567 if (!debugfs_root)
1130e5b3 3568 pr_warn("regulator: Failed to create debugfs directory\n");
ba55a974 3569
f4d562c6
MB		 3570 debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
3571 &supply_map_fops);
1130e5b3 3572
34abbd68
MB		 3573 regulator_dummy_init();
3574
3575 return ret;
414c70cb
LG		 3576}
3577
3578/* init early to allow our consumers to complete system booting */
3579core_initcall(regulator_init);
ca725561
MB		 3580
3581static int __init regulator_init_complete(void)
3582{
3583 struct regulator_dev *rdev;
3584 struct regulator_ops *ops;
3585 struct regulation_constraints *c;
3586 int enabled, ret;
ca725561 3587
86f5fcfc
MB		 3588 /*
3589 * Since DT doesn't provide an idiomatic mechanism for
3590 * enabling full constraints and since it's much more natural
3591 * with DT to provide them just assume that a DT enabled
3592 * system has full constraints.
3593 */
3594 if (of_have_populated_dt())
3595 has_full_constraints = true;
3596
ca725561
MB		 3597 mutex_lock(&regulator_list_mutex);
3598
3599 /* If we have a full configuration then disable any regulators
3600 * which are not in use or always_on. This will become the
3601 * default behaviour in the future.
3602 */
3603 list_for_each_entry(rdev, &regulator_list, list) {
3604 ops = rdev->desc->ops;
3605 c = rdev->constraints;
3606
f25e0b4f 3607 if (!ops->disable || (c && c->always_on))
ca725561
MB		 3608 continue;
3609
3610 mutex_lock(&rdev->mutex);
3611
3612 if (rdev->use_count)
3613 goto unlock;
3614
3615 /* If we can't read the status assume it's on. */
3616 if (ops->is_enabled)
3617 enabled = ops->is_enabled(rdev);
3618 else
3619 enabled = 1;
3620
3621 if (!enabled)
3622 goto unlock;
3623
3624 if (has_full_constraints) {
3625 /* We log since this may kill the system if it
3626 * goes wrong. */
5da84fd9 3627 rdev_info(rdev, "disabling\n");
ca725561
MB		 3628 ret = ops->disable(rdev);
3629 if (ret != 0) {
5da84fd9 3630 rdev_err(rdev, "couldn't disable: %d\n", ret);
ca725561
MB		 3631 }
3632 } else {
3633 /* The intention is that in future we will
3634 * assume that full constraints are provided
3635 * so warn even if we aren't going to do
3636 * anything here.
3637 */
5da84fd9 3638 rdev_warn(rdev, "incomplete constraints, leaving on\n");
ca725561
MB		 3639 }
3640
3641unlock:
3642 mutex_unlock(&rdev->mutex);
3643 }
3644
3645 mutex_unlock(&regulator_list_mutex);
3646
3647 return 0;
3648}
3649late_initcall(regulator_init_complete);
Linux 6.x block layer and io_uring tree(s)